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 .
