upset the balance 打亂均勢
His wife's sudden death upset the balance ofhis mind.
他妻子突然去世, 他感到六神無主.
If we don't stop destroying forests, we may upset the balance of nature.
如果我們再不停止破壞森林,我們將破壞大自然的平衡.
break the balance破壞平衡
We can break the balance of nature by increasing the category and quantity of pests' natural enemy so as to limit their growth and thus prevent the harm.
而增加對害蟲天敵的種類或數(shù)量,來打破自然界的相對平衡,使之不利于害蟲種群的增長,從而減少和防止它們的為害