the hares waged war with the eagles, and called upon the foxes to help them. they replied, "we would willingly have helped you, if we had not known who you were, and with whom you were fighting."

count the cost before you mit yourselves.

兔子和老鹰在争斗。处于劣势的兔子请求狐狸来帮忙。狐狸回答说:“如果我们不知道你们的力量以及你们的对手的话，本来是非常愿意帮忙的。”

做事情要审时度势。