vt.使失去平衡；重于
vi.摔倒，傾翻；失去平衡
n.失去平衡；超重
The acrobat pretended to overbalance and the audience held their breath. 雜技演員裝做失去平衡，觀眾屏住了呼吸。
An increase in background gas, as the mud weight overbalance gradually decreases. 由于鉆井液密度逐漸下降失去平衡，鉆井液的含氣量上升。
