Deltametal
δ高强度黄铜
🗣️ 情景例句
I find that hard to swallow.
对这一点我难一相信。
We are running on two shifts.
我们实行的工作是两班倒。
Once we get down to the oil, it usually flows to the surface because great pressure,
一旦到达油层，石油就会由于地下巨大的压力流到地面上来，