heavy traffic的用法和樣例：
例句
- He was late owing to/due to the very heavy traffic.
他遲到是因為交通擁擠。 - His lateness was due to the very heavy traffic on the motorway.
他遲到是因高速公路上車(chē)輛過(guò)多所致。 - Heavy traffic poses a problem in many old towns.
交通擁擠是許多舊城鎮的難題。 - What heavy traffic!
多擁擠的交通！ - The heavy traffic crawled through the narrow tunnel.
擁擠的車(chē)輛慢吞吞地穿過(guò)狹窄的隧道。
