Here we go.我们走吧。/在这儿。

A: We're all ready to start the trip.
我们做好了旅行的准备了。
B: That's great. Here we go.
太好了！我们走吧。

Here goes.(困难的事情）得试试才行。/走吧。

A: l'm going to try to draw a picture. Here goes.
我想尝试画画，一定得试试才行。
B: I don't think you have much talent at drawing.
我认为你没多少绘画天赋。
A: It is too rainy to have a picnic today.
今天雨太大，不能去郊游了。
B: There goes that. Maybe we can go to the movies instead.
那就没办法了。要不然，我们去看电影吧。