Silfbronze
西尔夫黄铜, 含锡镍 4Silfbronze6黄铜
🗣️ 情景例句
let me give you some additional thoughts and ideas I have.
让我提出一些另外的想法。
Easier said than done.
说时容易做时难。
Opportunity knocks but once.
机不可失，时不再来。