gauge [ɡeɪdʒ]

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vt.精确计量；估计；n.标准度量；计量器

to calculate an amount , especially by using a measuring device

Can you gauge what her reaction is likely to be? 你能揣测她的反应可能是什么吗？
It's difficult to gauge one's character. 要判断一个人的品格是很困难的。