this和these都是指示代词，this表示这个，用于单数；these表示这些，用于复数。
this的用法及例句：
this的英式发音是[ðɪs]，美式发音是[ðɪs];指代这、这个。
1. This is a clear demonstration of how technology has changed.
这清楚地表明了技术已有了怎样的进步。
2. I think they got the message that this is wrong.
我认为他们已经得到了消息，知道这是错误的。
3. Our discussion in the previous chapter continues this line of thinking.
我们上一章的讨论延续了这一思路。
4. I cannot force you in this. You must decide.
在这件事上我不能强迫你。你必须自己决定。
5.This is the end of a tour so I'm a little antsy, I guess.
旅途就此结束了，这让我有点坐立不安，我想是吧。
6. This document embodies the concern of the government for the deformity.
这个文件体现了政府对残疾人的关怀。
7. He avoided this tricky question and talked in generalities.
他回避了这个非常微妙的问题，只做了个笼统的表述。
8.More seriously for him, there are members who say he is wrong on this issue.
对他来说更严重的是，有成员说他在这个问题上错了。
these的用法及例句：
these的英式发音是[ðiːz]，美式发音是[ðiːz];指代这些。
1. In these and several other respects, there are many inventions and exaggerations.
在这些方面和其他几个方面都存在许多捏造与夸张之处。
2. These studies have already thrown up some interesting results.
这些研究已经得出一些有趣的结果了。
3. These auxiliaries have made our work much easier.
有了这些辅助人员，我们的工作才顺利多了。
4. The trouble is that these restrictions have remained while other things have changed.
问题是其他事情都变了，而这些条条框框还在。
5. Many of these poems bear witness to his years spent in India and China.
这些诗中有很多见证了他在印度和中国度过的岁月。
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