他们被困在交通堵塞中。

They got stuck in a ___traffic ___jam.

有很多交通堵塞，因此污染严重。

There are lots of ___traffic ___jams, so they are very polluted.

早高峰通勤经常导致市中心交通堵塞。

The morning commute often causes a ___traffic ___jam in the city centre.