机械师

jī xiè shī chāi kāi jī qì kàn wèn tí chū zài nǎ

机械师拆开机器，看问题出在哪。

The machinist dismantled the machine to see where the problem is.

yǒu néng lì de jī xiè shī yīng gāi néng gòu zhǎo dào wèn tí de gēn yuán

有能力的机械师应该能够找到问题的根源。

A competent mechanic should be able to get to the root of the problem.