Silfbronze
西爾夫黃銅, 含錫鎳 4Silfbronze6黃銅
??? 情景例句
How long?
多久？
Why are you going back?
你為什么回來(lái)？
I would like to give you an example, but fortunately I cannot do so.
我愿為你舉個(gè)例子，但幸虧我舉不出。