做词根的时候
-tain-, root. -tain- comes from French and ultimately from Latin, where it has the meaning "hold. '' It is related to the root -ten-. This meaning is found in such words as: abstain, attain, contain, detain, entertain, maintain, obtain, pertain, rein, retain, retinue, sustain.
是这样的
但一般没人去追踪这些词的根源,不知道这是不是一个有效的学习方法