Tomac
顿巴黄铜(铜锌合金)
🗣️ 情景例句
To help us make this transaction possible,
是的，为了促成这笔交易，
He is having a temper tantrum.
他在大发脾气。
Even more processes are never patented at all but kept as secret processes.
更多的工艺过程根本就不会取得专利权，而是作为秘方保存着。