好刚用在刀刃上

好刚用在刀刃上:

Literally means:

use the best steel to make the knife's edge; use resources where they are needed most.

Actually means:

刃, the edge of knife, determines whether the knife can cut things quickly.

This phrase figuratively means that things like human resources, materials and wealth should be used at key areas or at the critical moment in order to make the most of them.

It is often used to call for cautious use when esources inadequate.

刃，刀具的锋利部分，是能否顺利切割东西的关键。

好刚用在刀刃上，比喻要把人力、物力、财力等用在关键地方或关键时刻，以便充分发挥它们的作用。

好刚用在刀刃上，特指这些资源不充足时，要慎重使用。