That /those is used to emphasize the same meaning expressed by a word or phrase mentioned above, for example: asian buffalo isn't as wild as that of america's. The difference between these and those is that they have different meanings. Those refers to those, and these refers to these. To refer to something in front of you, or something close, regardless of time or distance, use these; to refer to something far away, regardless of time or distance, use those. . Those / these are determiners and are used before nouns to refer to a particular group of things / people, e.g.
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That and those are used to replace the nouns mentioned earlier. the weather in shanghai is not so cold as that in beijing. These people / those rules / those buildings. Asian buffaloes are gentler than their American counterparts. Here that refers to buffalo.
For example: those who are interested in photography should bring their cameras.
The weather in Shanghai is not as cold as in Beijing. the radios made in tianjin are as good as those made.
