它们

This paper expounds the photochemical reaction of alkenes, ketones and aromatic hydrocarbon, and discusses the mechanism of their photochemical decomposition and the application of photochemistry in organic synthesis.

本文介绍了烯、酮、芳烃体系的光化学反应，从光化学过程讨论了它们的光解机理以及它们在有机合成中的应用。

These species time their sexual reproduction with periods of environmental uncertainty, and reproduce asexually when conditions are more favourable.

这些物种按环境不确定的时期安排它们有性生殖的时间，当条件较为有利时它们进行无性繁殖。

I could evolve from either, that is, I could asexually mutate new fish from either the fat yellow one or the tiny blue one, or I could mate the pair and select from their joint offspring.

我可以从它们中任意一条开始进化，也就是说，我可以从那条胖鱼或那条小蓝鱼任意一条无性变异出新的鱼，或者我可以让这一对儿进行交配，从它们结合所产生的后代中挑选。

Medical colleges were instructed that if they wished to benefit from the Rockefeller largesse they had better convince 500 million Chinese to throw into the ashcan the safe and useful but inexpensive herbal remedies of their barefoot doctors, which had withstood the test of centuries, in favor of the expensive carcinogenic and teratogenic "miracle" drugs Made in USA, which had to be replaced constantly with new ones, when the fatal side-effects could no longer be concealed; and if they couldn't "demonstrate" through large-scale animal experiments the effectiveness of their ancient acupuncture, this could not be recognized as having any "scientific value".

医学院校被告知，如果它们想从洛克菲勒慷慨的赠与中得到好处，它们必须使五万万中国人民信服地把他们经过多少个世纪检验的赤脚医生安全、有效却又廉价的草药扔到垃圾箱里，让中国人民赞成使用美国制造的昂贵的有致癌、致畸作用的"神"药，当这些药致命的副作用再也掩盖不住的时候，则需要不断地用新药来替代；如果他们不能通过大规模的动物实验来"验证"他们古老的针灸的有效性，这就不能认为有任何"科学价值"。

Lowland trees may lean to this side and that, though it is but a meadow breeze that bends them or a bank of cowlips from which their trunks lean aslope.

低地处的树木会东倒西歪，虽然让它们东倒西歪的，不过是草地上吹过的一阵阵微风；或者，它们的躯干倾斜到一边，不过是由于一排野樱草的影响。

Lowland trees may lean to this side and that, though it is but a meadow breeze that bends them or a bank of cow lips from which their trunks lean aslope.

低地处的树木会东倒西歪，虽然让它们东倒西歪的，不过是草地上吹过的一阵阵微风；或者它们的驱干倾斜到一边，不过是一排野樱草的影响。

Lowland trees may lean to this side and that, though it is but a meadow breeze that bends them, or a bank of cowslips from which their trunks lean aslope.

低地上的树木会东倒西歪，虽说使它们弓腰曲背的，不过是草地上吹过的一阵阵微风；或者；它们的躯干歪到一边，不过是由于一排野樱草的影响。

Firstly a comparison is made of several of Dingji dialect's aspectual auxiliaries:"liao, guo, diao, dao, le, zhe, zai", comparing differences and similarities in their function and meaning, revealing the manner of their interaction.

首先是对丁集话"了、过、掉、倒、勒、着、在"这几个体貌助词作了内部比较，比较它们功能和意义上的异同，找出它们之间的相互关系。

That is why they sent Assur; with him, they are certain they will be victorious.

这就是它们为什么派亚述尔；有了他，它们相信自己必将取得胜利。

No matter what the things may be, no matter what they are good or no good for,there they are, each with a thrilling unique look and feel of its own, like a face; the iron astringently cool under its paint, the painted wood familiarly wamer,the clod crumbling enchantingly down in the hands, with its litter dry smell of the sun and of hot nettles; each common thing a personality marked by delicious differences.

但这孩子内心的喜悦却是至纯至真大，是对这件事物的内在特性感到真正的心醉神迷，不管这些事物是什么，也不管它们对什么有用或者没用，它们自然地存在着，有着自己动人的外观与感觉，就像一张面孔那样；油漆下面冰凉的钢铁，温暖可亲的彩色木料，拿在手中一揉就碎的令人着迷的土块，微微含着日晒与荨麻的干燥气味；各种普通的事物都有着可爱的差别，因而都突显了其独特的性格。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。