size up; size-up 估量；估計；掂量；打量；判斷；看待；估計……的大小（或多少）；品評；符合要求；判斷估計某物的大小達到某種標準（或規格）

measure with the eye；look sb. up and down

例句：

The situation is hard to size up. 情況不可捉摸
You should go down there to size up the situation. 你應該下去瞭解一下情況。