Those / these are determiners and are used before nouns to refer to a particular group of things / people, e.g. These people / those rules / those buildings. That和those用来代替前面说过的名词。 the weather in shanghai is not so cold as that in beijing.
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亚洲水牛比美洲的同类要温柔一些。 此处that 指代 buffalo 。
例如:those who are interested in photography should bring their cameras.
上海的天气没像北京那么冷。 the radios made in tianjin are as good as those made.