今天我来为大家介绍一下梧桐树。
梧桐树,即“中国梧桐”,是梧桐科梧桐属的植物,别名青桐、桐麻,也属落叶大乔木,一般高达15米;树干挺直,树皮绿色,平滑。原产中国,南北各省都有栽培,也为普通的行道树及庭园绿化观赏树。我们所说的法国梧桐其实是悬铃木中的一种。
梧桐树的叶子极似枫树叶,甚至连脉络都一样。梧桐树的叶子会变色哦!春天的时候,叶子是嫩绿嫩绿的;一到秋天,叶子就会慢慢变黄。这是为什么了呢?原来在夏天时,树叶工作得很努力,可是,天气转凉后,它就停止了工作。树叶所制造的营养也就不能送到树枝和树干上,而沉淀在叶子里。树叶的叶绿素也会遭破坏,就和留在叶子里的养分或枯萎了的茶褐色混合,这样就变成各种美丽的颜色了所有的树叶中都含有绿色的叶绿素,树木利用叶绿素捕获光能并且在叶子中其他物质的帮助下把光能以糖等化学物质的形式存储起来。除叶绿素外,很多树叶中还含有黄色、橙色以及红色等其他一些色素。虽然这些色素不能像叶绿素一样进行光合作用,但是其中有一些能够把捕获的光能传递给叶绿素。在春天和夏天,叶绿素在叶子中的含量比其他色素要丰富得多,所以叶子呈现出叶绿素的绿色,而看不出其他色素的颜色。当秋天到来时,白天缩短而夜晚延长,这使树木开始落叶。在落叶之前,树木不再像春天和夏天寻样制造大量的叶绿素,并且已有的色素,比如叶绿素,也会逐渐分解。这样,随着叶绿素含量的逐渐减少,其他色素的颜色就会在叶面上渐渐显现出来,于是树叶就呈现出黄、红等颜色。
梧桐树的价值也很大哟。梧桐树为栽培于庭园的.观赏树木。木材轻软,为制木匣和乐器的良材。种子炒熟可食用或榨油,油为不干性油。根皮、茎、叶、花、果和种子均可药用,治腹泻、疝气、须发早白,有清热解毒的功效。树皮的纤维洁白,可用以造纸和编绳等。木材刨片可浸出粘液,称刨花,润发。
梧桐子是梧桐树的种子。秋末至冬初采收,除去杂质,晒干。干燥种子,圆球形或类圆形,径6~8mm,黄棕色至深棕色,表面皱缩成网纹状。外层种皮较脆,易破裂,内层种皮坚韧。除去后,内有肥厚的淡黄色胚乳;子叶两片薄而大,紧贴在胚乳上,胚根位于较狭的一端。气、味均微。以个大、饱满、棕色、无杂质者为佳。陶隐居云:“桐树有四种,青桐叶皮青似梧而无子。梧桐色白,叶似青桐而有子,子肥亦可食。”李时珍说:“梧桐处处有之。树似桐而皮青不皵,其木无节直生,理细而性紧。叶似桐而稍小,光滑有尖。其花细蕊,坠下如醭。其荚长三寸许,五片合成,老则裂开如箕,谓之藁鄂。其子缀于藁鄂上,多者五六,少或二三。子大如胡椒,其皮皱。其子,甘平无毒。”
梧桐树就是这样的哟。
大家一定都听说过火龙果吧。
火龙果大概有我的两个拳头大。梅红色的表面十分好看,从远处望去,还真像一团火焰呢!如果你凑近仔细看,会发现火焰里面夹杂着许许多多白白的小点点。梅红色的表皮上长着十几片软软的,像剑一样的鳞片,螺旋形地长着,似乎是一条绕着圈圈的楼梯。鳞片的底下和火龙果的表皮一样,也是梅红的,中间是黄色的。等到了最上面,就完全变成绿色的了。在火龙果的顶部,有一个小洞。在火龙果的底部有三个一簇的小尖刺,扎到手上一定会出血,你可要小心哦。把鼻子凑近,深深吸一口气的话,一股淡淡的青草味扑鼻而来,沁人心脾。
切开一看,火龙果表皮里外的颜色是不一样的,靠果实的那边明显比要靠外的那边深。果肉是白色的,纤维状的,有数不清的黑籽在里面,像黑色的鱼籽酱。挖一勺尝尝,清甜爽口,像加了芝麻的冰淇淋。黑籽滑过舌尖,麻麻的,嚼一下,香脆香脆的真好吃。吃完以后,火龙果就像一只小船,红红的,漂亮极了。用手一挤,边缘里的红汗就流出来了,好像血。
这就是火龙果,你有没有垂涎三尺呢?赶快尝一尝吧!
Dearest Mother and Father:
I thank you for all the things you did for me over these years, without you, I would still be a toddler that don\'t know how to respect my friends. Without you, I would remain a child forever, without you, my homeworks and assignments would forever be \"lost\" and excused. I remembered, clear as glass, the glorious days we had when I was young, when we went travelling everywhere and our smiles on our pretty faces each and every single second. My heart felt very warm and thankful whenever I thought of you, it\'s like there\'s an unknown bond between the three of us, it tied us together, and made us a true family.
Your Love and Star,
xx
dear vvx,
my name is vvx.i\'m writing to you to introduce my family to you.there are four people in my family.they are my father, my mother, my sister and i. my father is a worker in a factory. my mother is a teacher in a middle school. my sister is a primary school student and she is 8 years old. i’m a middle school student and i’m 14 years old.
look forward to hear from you soon.
yours,
vvx
Dear Wang Hua,
How are you going on recently? I’m glad to tell you that I have planned to go to Zunyi Teachers’ College to study Chinese soon.Could you please give me some advice on how to learn Chinese well?
Write back soon.
Tom
大家都常吃桂圆,但你们了解它么?那就让我为大家作个介绍吧!
桂圆在小芽的时候仅有两三片叶子组成,需要几年才能长成大树。树的叶子是长卵形的。树木即葱郁又茂盛,简直是苍翠欲滴。它高有5。6米,不久就会长出小花,花的颜色是洁白的,其中还带着一总淡黄色,显得很淡雅,还有一股淡淡的清香。仔细观察桂圆,它的外皮是土黄色的。轻轻的剥开外皮,就会看到洁白,晶莹剔透的果肉,果肉里包着一棵紫红色的果核,好像一棵玛瑙,十分漂亮!
轻轻地咬一口,甘甜爽口,美味级了,让你吃了一颗还想下一颗。桂圆的营养很丰富,含葡萄糖,蔗糖。维生素A。B。B2。C等其他营养物质。对体制虚弱的人也有许多帮助呢!所以气色不好的应该多吃桂圆。
关于桂圆还有一个传说呢!很久以前蛟龙总要兴风作浪,桂圆与蛟龙大战三天三夜,斩死蛟龙,挖出龙眼。县官来夺龙眼,桂圆寡不敌众,吞下一只龙眼,另一只“轰隆”炸裂。乡亲们将桂圆葬在村边。第二年,桂圆的坟上长出一种树,结出累累果实,果肉和果核就像龙的眼睛。为了纪念桂圆,人们将晒***龙眼果叫“桂圆”。
大家听完我的介绍,知道桂圆对我们有益处了吧!回家我也要给爸爸妈妈做一碗桂圆汤,让爸爸妈妈重新焕发出青春的美丽。
dear chen lin and li hua,
i’ve just been out of hospital for a couple of days. right now ,i am really fine, but without your support, i wouldn’t have got better so soon.
you know, the traffic accident gave me a very hard blow, both physically and mentally. in the first two weeks after my injury, i almost lost my confidence in my future life. it is the doctors’and your encouragement that rendered me much strength and determination。
anyway, i learned a lot from this unfortunate accident. i’d neverrealize how important your friendship was to me. i can’t say anymore to show my gratitude for your taking turns keeping me company,and getting me through the blue time.
next saturday, my mother would give a recovery party to thank myfriends. i really want to see you there. so, 7 o’clock at my place,ok?
your truly,
li ming
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