mechanical

这次飞机坠毁被归因于机械故障。

The plane crash was attributed to a ___mechanical failure.

飞机似乎因机械问题而坠毁。

The plane appears to have crashed because of a ___mechanical problem.

我的兄弟是一名设计工业机械的机械工程师。

My brother is a ___mechanical engineer who designs industrial machinery.