代表观察。观察是最好的老师。

O is for observation; observation is the best teacher. O.

youdao

对某事，在某时候，观察是最好的老师。

For something, sometimes, observation is the best teacher.

youdao

对某事，在某时候，观察是最好的老师。

For something, sometimes, observation is the best teacher.

youdao