just about

judge…by… 根据……作出判断，以……评价某人

【例句】

◆ We can't judge a magazine by its cover.我们不能单从封面去判断一本杂志的优劣。 

◆ Don't judge a man by his looks．不要以貌取人。

【联想】

judging by/from.…从……判断：

Judging by his appearance, he must be over fifty．从外表上看，他一定有五十多岁了。