vt.使失去平衡；重于
vi.摔倒，倾翻；失去平衡
n.失去平衡；超重
The acrobat pretended to overbalance and the audience held their breath. 杂技演员装做失去平衡，观众屏住了呼吸。
An increase in background gas, as the mud weight overbalance gradually decreases. 由于钻井液密度逐渐下降失去平衡，钻井液的含气量上升。
