这个词的演变过程很有趣，可以追溯到古法语。

The ___derivation of this word is interesting, tracing back to Old French.

'教师'这个词是从'教'这个根词衍生而来的。

The word 'teacher' is a ___derivation from the root word 'teach'.

这个词的词源追溯可以解释它现在的意义。

The ___derivation of this word's meaning can explain its current usage.