在下午用英文怎么表达？?

　　他们经常在下午作些市场调查。

　　They often do some research in afternoon.

　　警察在下午3：30接到电话。

　　Police were called about 3.30pm.

　　最后，在下午四点五十分接她回家。

　　At last, I walk her back home at 4:50pm.

　　在下午，我们打算一起去公园。

　　In the afternoon, we are going to the park together.

　　这个地区的市场在下午最繁忙。

　　The market in the country is busiest in the afternoon.