Everdur
爱维杜尔铜合金(铜硅锰合金)
🗣️ 情景例句
I had never been there before.
我以前从来没有去过那里 。
The shoes are worn-out.
这鞋已经不能穿了。
and a very firm hand must be employed in the early stages.
因此开始阶段需要有一位强有力的老手。