树立科学爱眼护眼的思想,对我们小学生来说是多么重要。
眼睛,主要可以分为三个部分,分别是眼睛附属,眼球和视觉。其中巩膜可以保护眼睛,所以它就得到了一个雅号——叫做“相机壳”。还有“泪器”,它专门负责让人流眼泪,所以它被人们称为——眼睛的清洁工。
眼睛就像一个照相机,各个部分有各种不同的功能,比如说:透明而且光力强的角膜及晶状体相当于镜头;依光线强弱可缩小或开大的瞳孔相当于光圈;含有丰富的色素,具有遮光作用的脉络膜相当于暗箱;感光组织视网膜则相当于感光胶片。
眼睛的工作过程大致是这样的;自然界各种物体在光线的照射下反射出明暗不同的光线,这些光线通过角膜、晶状体等结构的折射作用,聚焦在视网膜上,视网膜上的感光细胞产生一系列的电化学变化,将光刺激转挽成为神经冲动,通过视觉通路传导至大脑的视觉中枢,完成视觉功能。在上述过程中,瞳孔可调节进入眼球内的光线;晶状体也通过调节作用,保证光线准确地聚焦在视网膜上,从而获得一个完整清晰的物像。
由此可见,眼睛完成一次视觉动作,是一个复杂、精细的过程,其中任一细节出现障碍,就无法获得正确的“照片”了。
眼睛的功能再好,不保护眼睛也是没用的,必须遵守三要三不要:
一要注意用眼卫生。看书还是用电脑时间都不宜过长,每隔30至40分钟休息10~15分钟,眺望远处,让眼睛放松。每天在电脑前不超过6小时。
一不要在光线暗的地方看书。如:卫生间。卫生间光线暗,光源不科学,对眼睛有损伤。有人躺床上看书,姿势差会加重眼睛负担。
二要注意眼睛锻炼,做眼保健操能使血液畅通放松肌肉,缓解疲劳。进行球类活动时,当眼球追随目标,睫状肌放松、收缩,提高眼的血液灌注量,促进眼部新陈代谢。
二不要经常性地点眼药水。刚使用时眼睛会感觉非常舒服,长久使用,可能导致青光眼,使视力受损甚至致盲,任何手术与药物都无法挽救,不是吓唬你啊。
三要多吃保护眼睛的食物,补充营养。维生素A和胡萝卜素是人体正常代谢的主要营养素。注意补充水分,多吃豆制品、鱼、牛奶、青菜、西红柿及新鲜水果等有助于保护眼睛。
三不要使用劣质太阳镜。劣质太阳镜,阻挡紫外线的性能不强,涂膜容易破损使透光度严重下降,眼睛犹如在暗室中看物,此时瞳孔会变大,残余的紫外线会大量射入眼内,使眼睛受损。别让时尚的太阳镜成“眼***手”,要选用好的太阳镜。
我有一个同学,他曾经告诉过我,他的眼睛以前也是很健康的,可是后来,他家买了电脑,他迷上了电脑,导致了他的视力一天不如一天,最终戴上了眼镜。
有一次,由于我上网时间长,眼睛又痒又痛,就一直用手去揉搓,结果眼睛红了一大片,更加痛苦难受,视物也模糊不清,我害怕地直叫妈妈,千万不要让我害了自己……医生开了眼药水,并语重心长地嘱咐:“小朋友,要少看电视、少上电脑,多吃水果、胡萝卜,书写姿势一定要端正,还要注意眼部的休息及运动,才能拥有一双明亮的眼睛哦!”
几天后,谨遵医嘱的我,重新找回欢乐。
同学们,让我们保护好心灵的窗户,让我们拥有一双明亮的眼睛吧!
短短两天的其中考试结束了,随之而来的翘首企盼的成绩也揭晓了。这成绩给我留下的则是深深的思索。总结经验教训,我觉得自己太马虎大意了,还有就是平时努力程度不够。痛定思痛,我觉得只有发扬“锲而不舍,金石可镂”的精神,才能真正的掌握知识,丰富自己,提高自己的学习成绩。
中国有句古语说得好:宝剑锋从磨砺出,梅花香自苦寒来。我觉得这也是一句学习上的至理名言。兴有在是常的学习上一点点积累认真努力、坚持不懈的面对学习上的困难,发扬锲而不舍的精神去攻克它,我们才能真正成为学习上的强者,才能骄傲而又自信的面对挑战,路漫漫其修远矣,吾将上下而求索。
滴水可以穿石也是锲而不舍精神的'体现。我们航行在没有边际的学习海洋上,只有凭借这种精神,才可能到达知识的彼岸,学习是一件苦差事,它既不生动又不有趣,既不是立体的又不是鲜活的事物,只有我们明白它的重要性,坚持不懈地努力下去,才能羸得鲜花和掌声。记住,没有不劳而获的美事。
幼年的李白因为看到一位老婆婆用铁棒磨绣花针而醒悟,从而发奋读书,终于成为一代诗仙。前有古人可鉴,我们这些新世纪的青年该怎样去做呢?这是一个时代留给我们的课题。朋友,请坚信“只要功夫深,铁棒磨成绣花针”,让我们鼓足勇气,锲而不舍的锁定自己的学习目标,奋勇前进吧!
“锲而舍之,朽木不折;锲而不舍,金石可镂。”这是战国先秦儒家代表人物荀子的《劝学》一文中的句子。它充分的说明了在学习上,只有锲而不舍地学习,才能达到金石可镂的地步。同学们,让我们发扬这种精神,在学海上扬帆,奋勇前进吧!
to prevent H7N9 we should know some common sense. First of all, it is important for us to prevent H7N9 from ourselves. For example, clean our hands frequently.
Sencondly, do more exercises. Such as running. Lastly, change our diet to keep balence. For example, eat more types of vegetables and drink more water
How to prevent the H7N9?
As is well known,the A flu is spreading throught our country. However, if we negnect it, the deadly H7N9 may cause more infectors,or even more deaths. So what is the most important is that we should take some effective measures to prevent it.They can be listed as follows.
Firstly,it is necessary for you to realize the Avian flu can be prevented if you develop good living habits. For example,you shouldn’t forget to wash your hands before meals.Besides,don’t spit everywhere and try to cover your mouth or nose with paper or hankerchiefs when you have to cough or sneeze.What’s more, remember to wear the mouth-cover if you have to go to the public places, such as the crowded cinemas,supermarkets, buses,where the A flu may spread easily.
Secondly,of course, taking exercise more often and taking good sleep to build your body are wise choices for you to reduce the risk of being infected.
Last but not the least, if you are unlucky to be infected with the slight flu cold, try to stay at home,and take some medicine. Do pay attention to your daily body temperature. If you have a high fever, go to the hospital without delay for further treatment. Make sure you are not expected to come back to school before the cold or flu is cured.
Only by doing like this can you prevent or defeat the A flu in the end.
Expert tips on how to prevent avian influenza H7N9 collated by current argument data dictionary
1.平时加强体育锻炼,多休息,避免过度劳累,不吸烟,勤洗手;注意个人卫生,打喷嚏或咳嗽时掩住口鼻。
1 usually strengthen physical exercise, rest more, avoid excessive overworked, do not smoke, wash their hands; pay attention to personal hygiene, when sneezing or coughing and cover your nose and mouth.
2.保持室内清洁,使用消毒液清洗的地毯,避免使用难以清洗的地毯,保持地面、天花板、家具及墙壁清洁,确保排水道通畅;保持室内空气流通,应每天开窗换气两次,每次至少10分钟,或使用抽气扇保持空气流通;尽量少去 空气不流通的场所。
2 keep the room clean, use disinfectant cleaning carpets, avoid the use of hard to clean the carpet, keep the floor, ceiling, furniture and walls clean, to ensure smooth drainage channel; maintains the indoor air circulation, ventilation windows should be at least two times a day, 10 minutes each time, or use a fan to keep air circulation; as little as possible to airless places.
3.注意饮食卫生,进食禽肉、蛋类要彻底煮熟,加工、保存食物时要注意生、熟分开;养成良好的卫生习惯,搞好厨房卫生,不生食禽肉和内脏。解剖活(死家禽、家畜及其制品后要彻底洗手。
3, pay attention to food hygiene, eating meat, eggs should be thoroughly cooked, processing, preservation of food to the attention of raw, cooked separately; develop good health habits, good kitchen hygiene, do not eat raw poultry meat and offal. Anatomy of living (dead to wash hands thoroughly, livestock and poultry products.
同时,在户外洗手不方便的时候,可以使用免洗洗手液,随身携带,随时随地隔离病菌,呵护您的健康。
At the same time, when the outdoor hand-washing is not convenient, can use hand sanitizer, carry whenever and wherever possible, isolate the pathogen, take care of your health.
4.发现疫情时,应尽量避免与禽类接触;公众特别是儿童应避免密切接触家禽和野禽。
4 found in the epidemic, should avoid contact with poultry; the public especially children should avoid close contact with poultry and wild birds.
5.注意生活用具的消毒处理。禽流感病毒不耐热,100°C下一分钟即可灭活。对干燥、紫外线照射、汞、氯等常用消毒药都很敏感。
5 pay attention to disinfection and living appliances. Avian influenza viruses do not heat, 100 ° C, one minute can be inact
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