Let's go to the Botanical Gardens.

让我们去植物园。

I've been to the Botanical Gardens.

我到过植物园。

Have you been to the Botanical Gardens yet?

你到过植物园吗？

Yes, I've just been to the Botanical Gardens.

是的，我刚刚到过植物园。

There are 160 botanical gardens in China at present.

中国目前已有植物园160座。