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问题: 语法问题请帮忙

Life on a space station is not boring,he says.There are many experimentsto do,some of them automatic,others very much hand-on.
这句话中some of them和others后面问什么不用加are呢?

解答:

some of them automatic,others very much hand-on 在这个句子里是独立主格结构,补充说明experiment
如果在里边加上are的话就变成了两个独立的分句,这样句子就变成了:
There are experiments to do,some of them are automatic ,others are very much hand-on.从这句话中我们知道有语法错误,因为是三个独立的句子但是中间没有连词进行连接,所以不能成为完整的一句话, 所以如果加are,就要在 some .other 的前边加上连词and,这样就变成了三个并列的句子组成一句话,如果没有连词and就不能加are