let's see1 (also let me see) used when you are thinking about or trying to remember something 让我想一想〔用于正在想或努力记起某事时〕 Today’s date is – let me see, March 20th. 今天是——让我想想——3月20号。
Now, let’s see, where did I put your application form? 啊,我来想想,我把你的申请表放哪儿了呢?
let’s see• Okay, let's see, what were we talking about?
→ let’s see at let1(SPOKEN SECT)
2 → let me see