交通堵塞很严重。
交通出现了严重的阻塞。
A big traffic jam behind the column.
圆柱后是一次严重的交通拥堵。
One of the drawbacks of living in a big city is the traffic jam.
住在大城市的缺点之一就是交通堵塞。
It is well known that traffic jam is a big problem in big cities.
众所周知，大城市交通堵塞已成为很严重的问题。
It is well known that traffic jam is a big problem in big cities.
众所周知，大城市交通堵塞已成为很严重的问题。
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