be up know a thing or two
英
美
明白事理; 精明强干
be up know a thing or two的用法和样例:
例句
As soon as people are old enough to know better, they do not know anything at all.
当人们一旦老至应该更加明白事理之时,却是什么都不懂了。
目录
查词历史
英 汉