bell metal

例句：

1. 1.The bell metal was used to make the door knocker.
   钟金属被用来制作门铃。
2. 2.The bell metal was used to make the door knocker in the old days.
   在旧时代，钟金属被用来制作门铃。
3. 3. The bell metal was used to make the door knocker in the old days.
   在旧时代，钟金属被用来制作门铃。