Our supplier confirmed that all steel parts are tempered before shipping to the assembly plant.

我們的供應商確認所有鋼製零件在運往組裝廠前都經過回火處理。

The quality report shows the blades were not tempered long enough, so they cracked easily.

品質報告顯示這批刀片回火時間不足，所以很容易斷裂。

During the factory tour, the manager explained how workers temper metal to reduce brittleness.

在參觀工廠時，經理說明了工人如何將金屬回火以降低脆性。