the sun rises in the east and sets in the west, which is caused by the rotation of the earth as you all know. but have you ever thought of the effect of the earths rotation on man and can you imagine what would happen if the earth stopped rotating?
the radius of the earth is about 6,370 kilometres. it takes the earth 24 hours to rotate once. objects on the earths equator move with the earth at a speed of 460 metres per second, and the air close to the earths surface turns at the same speed. if the earth stopped rotating suddenly, the air would keep flowing eastward at a speed of 460 metres per second. the wind would be fourteen times as powerful as a hurricane. at the same time sea water would rush eastward at a speed of several hundred metres per second, which might do damages much greater than a seaquake would do. obviously, men could hardly stand such a catastrophe.
even if such a catastrophe would not happen, there would be a great temperature difference on the two hemispheres of the earth, and the four seasons of the year would no longer occur because a day and a night would be as long as a whole year instead of 24 hours. all this would greatly affect the life of human beings, imals and plants and that would cause worse results than anything imaginable.
每隔1小时休息一下双眼,不要持续操作。持续使用电脑时,要经常眨眨眼睛,防止眼睛干涩。眼睛距离35厘米大的屏幕不应少于60厘米,距离38厘米大的屏幕不应少于70厘米。屏幕应放在略低于视平线的位置。将屏幕的亮度与清晰度调整到适当水平,以眼睛感到舒适为准。要经常擦拭屏幕。屏幕过脏会使图像模糊,造成眼睛疲劳。
一开始,我们先要做热身运动——跑步。这次的跑步和以前有点不一样,以前是带着篮球跑5圈,而今天是快跑1000米。听到这句,我吓得魂飞魄散,不知道自己能不能坚持下来。
跑完步后,我们所有人都气喘吁吁。我却欣喜地发现,原来觉得做不到的事情,挺一挺,竟然做到了。
接着,顾老师又让我们打比赛。他很严肃地说:“我们篮球队已经训练了一段时间了,今天我们采用分成两队比赛的形式进行训练,这叫以赛促练。”最后又提高嗓门大声喊:“同学们有没有信心?”我们大声回答:“有!”一个个摩拳擦掌,已经准备好了“对战”。
比赛开始,我们都像老虎一样跑向对面。我跑去底线接应,突然一个球飞了过来,我接住了,顺势一投,唉,没进去。这时,我方的顾秋杨以个子高的优势来了个空中补篮,球进了!我们两个激动得相互击掌。
打到下半场中间时段,比分是8:10。我们一方是8分,比分暂时落后。我心里那个急啊:“球啊球,赶快飞到我手里来吧!”容不得我多想,顾秋杨接到了球,我们一个劲地猛跑,所有的人都上去抢球。我在旁边浑水摸鱼,球滚到了我的手上,顺势一个投篮,嘿,球进了!我高兴得又蹦又跳。突然,我没站稳,来了一个“飘移”,屁股都摔成了两半。朱昊天在旁边哈哈大笑。这真是标准的乐极生悲啊。
然而,我发现对面已经发起了猛攻,便带着伤回去防守。当我回去时,看见没有人接应,便以迅雷不及掩耳势跑上去接应,果然他传给了我,我和朱昊天用“飞速传球”直冲对面老巢,来了个三步上篮,球进了,我们胜利了。
这真是一堂特别的`篮球训练课。平时的队友成了对手。我方的胜利一波三折,来得太不容易。顾老师的确厉害,通过这次比赛,我和小伙伴们都感觉自己无论是心理还是球技都长进了不少。
这本书花了我300元。
I spent 300 yuan on the book.
I paid 300 yuan for the book.
The price of the book is 300 yuan.
It cost me 300 yuan to buy the book.
我不懂什么英语,李明也不懂。
I don’t know any English, nor does Li Ming.
I hardly know any English, nor does Li Ming.
I hardly know any English, neither does Li Ming.
I hardly know any English, no more does Li Ming.
I hardly know any English, so it is with Li Ming.
I know no more English than Li Ming does.
I know as little English as Li Ming does.
一到家,我就把所见到的一切都记了下来。
On/Upon arriving home, I wrote down everything I had seen.
As soon as I arrived home, I wrote down everything I had seen.
The moment I arrived home, I wrote down everything I had seen.
绿色对眼睛有好处,并不是指绿色本身对眼睛有什么好处,而是说远眺大自然的景物可缓解眼睛的疲劳状态。如果看33厘米以内的东西,即使是绿色的,对眼睛也没有益处。
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