face value
noun [ C usually singular ] uk/ˌfeɪs ˈvæl.juː/ us/ˌfeɪs ˈvæl.juː/
（邮票、硬币、纸币等的）票面价值，面值
the value or price that is shown on something such as stamps, coins, or paper money
Idiom
take something at face valueidiom C1 仅凭表象对…信以为真
to accept something as it appears to be rather than studying it more closely
I took the offer at face value. I didn't think they might be trying to trick me. 我对这提议信以为真，并没料到他们可能想要骗我。