Thus, these rolls require a higher surface hardness and must be hardened to a greater depth.

因此，辊子需要较高的表面硬度和较深的硬化层深度。

youdao

You must be sensitive to paint such things, and you need to be hardened to others' comments, yet you can't because you're an artist.

你必须敏感地捕捉画的主题，但你需要对他人的评论麻木，然而因为你是艺术家你无法做到。

youdao

According to the procedure used, steel can be hardened to resist cutting action and abrasion, or it can be softened to permit machining.

按所采用的步骤，钢可以通过硬化来抵抗切削和磨损，也可以通过软化来允许机加工。

youdao

But because the NRC defines an aircraft attack as a beyond-design-basis event, it did not require that this equipment meet high quality and reliability standards, or be hardened to withstand other potential threats, such as natural disasters.

CNN: Our reactors still vulnerable, a year after Fukushima

To the squawks of teachers, teaching qualifications are due to be hardened.

ECONOMIST: Greece

It needs to be hardened up, and fast.

ECONOMIST: Reality hits Japan