那裏有兩個人正在吃午餐。請幫忙用英文翻譯。?

There are two persons who having lunch now.
=There are two persons  having lunch now.=Two persons over there are having lunch now.

There are two people there having lunch.
lunch=lunches, no need to be plural in no.
There are=not Two there are;
there are there=superfluous is more than is necessary to describe the situation, not needed/wanted here.過多的,多餘的.
Hence:-eg:-
(1)They have lunch over there./Two have lunch over there.
over=prep,=on the far side of somewhere
(2)Two people are having lunch over(prep) there(=on the far side of somethere)

Two people are having lunch over there. 那裏有兩個人正在吃午餐。

There are two people having lunch.  有兩個人正在吃午餐。
There are two people having lunch in the restaurant. 在餐室内,有兩個人正在吃午餐。

Two there are having their lunches.
Two there are enjoying their lunches.

There are two people having lunch there.

There are two people having lunch there.

Two persons over there are having lunch now.

There are two people eating lunch over there 

There are two people who have their lunch.