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。
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.
我张开嘴正要对这番言论给予响应，忽然响起清脆的敲门声，紧跟着房东走了进来，手里托着一个铜盘，上面放着一张名片。
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