Selective hardening
[化] 局部淬火
🧩 词语组成解析
selective
[si'lektiv]
adj. 精心选择的;选择的，不普遍的;淘汰的;
n. 硬化, 淬火\\n[计] 硬化, 固化, 淬火
🗣️ 情景例句
How long have you known her?
你认识她多久了？
How much is it by registered mail?
挂号信要多少钱？
The children are no longer young, and they know who Father Christmas really is.
孩子们不小了，他们知道真正的“圣诞老人”是谁。