Silverine
铜镍耐蚀合金
🗣️ 情景例句
You are coming along well.
你进展得很好。
Do we have to wear the helmets?
我们得戴上防护帽吗？
It is being repaired by a friend of my father's.
父亲的一个朋友正在修理这件乐器。