what does "我们认识一下"mean in this phrase? and when can we use "一下"?
我姓张，我们认识一下，这是我的名片。 = Mi apellido es zhang, veamos, este es mi carnet / fotocheck (de identificación)。

Question

what does "我们认识一下"mean in this phrase? and when can we use "一下"?
我姓张，我们认识一下， 这是我的名片。 = Mi apellido es zhang, veamos, este es mi carnet / fotocheck (de identificación)。

Answer

我们认识一下 = Let me introduce myself. (And would you please introduce yourself?)
我们认识 ＝ We know each other.

So 一下 makes a huge difference to the meaning of the sentence.

Answer

一下 is added to a verb to express as try or a short action
here it's "let's try to get acquainted"

Answer

一下 is used after a Verb ,for example 等一下 看一下,it means a short time or try something

Answer

一下  not translate.this sentence just mean nice to meet u.