OG104求助

Nuclear fusion is the force that powers the Sun, the stars,and hydrogen bombs,merging the nuclei of atoms and not splitting them apart,as in nuclear reactors.

主要是关于LIKE 和 AS 的问题，有一个解释看不懂。

(b)merging the nuclei of atoms instead of splitting them apart ,like nclear reactors.

解释:Although like can grammatically be followed by a noun phrase such as nuclear reactors,here the basis of comparison is nuclear,and the usage is incorrect.

什么叫“the basis of comparison is nuclear"?