Make sure you've signed the check before sealing the envelope.
一定要在支票上签了名再封信封。
英语解释：~ sth (up / down) to close an envelope, etc. by sticking the edges of the opening together 封上(信封):
PS: 为了避免混淆，增加大脑负担，一个单词一种语境一次只记一种意思。
,
Make sure you've signed the check before sealing the envelope.
一定要在支票上签了名再封信封。
英语解释：~ sth (up / down) to close an envelope, etc. by sticking the edges of the opening together 封上(信封):
PS: 为了避免混淆，增加大脑负担，一个单词一种语境一次只记一种意思。
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