量ㄌㄧㄤˋliàng力ㄌㄧˋlì而ㄦˊér為ㄨㄟˊwéi

衡量自己的能力做事。宋·張君房《雲笈七籤·卷一○三·翊聖保德真君傳》：「法物所須，各以差降。士民之類，可 量力而為之。」也作「量力而行」。

英to weigh one's abilities and act accordingly, to act according to one's means, to cut one's coat according to one's cloth