That 's why students being called back to their classrooms is etymologically appropriate .

所以说，把学生召回课堂的讲法从词源上来看挺合适。

You can see the word candle there inside the word incandescent and etymologically it fits .

我们可以看到，单词incandescent中含有单词candle而且两者的词源也一致。

I never made much distinction between cement and concrete , but etymologically the have a different background and evidently they are technically different too .

我从来分不大清水泥（cement）和混凝土（concrete），不过从词源上看，两者的家底不同，严格来说，它们显然也是不同的东西。

There is no evidence that these words are etymologically related but there is a certain similarity to them .

没有证据表明这两个词有语源关系，不过它们有一定的相似之处。