knock together的用法和样例：
例句
用作不及物动词 (vi.)
- The two boats sank together after crashing.
这两条船相撞后同时下沉。 - He was so frightened that his knees knocked together.
他是那样害怕，以致两膝抖得相撞。
词汇搭配
- one's knees knock together 吓得两腿发抖...
- knock about together 同 ... 厮混
- knock their heads together 拿着两人的头撞(用武...
