KNOCK DOWN: To disassemble a previously assembled bearing; the cage is cut or spread and discarded and the rollers and cones are salvaged and reprocessed.
拆卸：把已经组装好的轴承拆开；保持架被切掉或拆卸展开然后丢弃，而滚子和内圈从其取出并重新进行加工。
2
I had opened my mouth to reply to this tirade, when with a crisp knock our landlady entered, bearing a card upon the brass salver.