But variables like pedestrians in crosswalks, large crowds and vehicle wrecks can throw a carefully designed system out of whack, leading to annoying and pollution-causing traffic jams.
但是，正在穿越人行横道的路人、摩肩接踵的人群以及道路上抛锚的事故车等不确定因素都可能让一套精心设计的系统崩溃失常，导致恼人而又产生污染的交通拥堵。
Their meetings cause endless traffic jams and annoying multi-car motorcades.
他们开会造成无休无止的交通堵塞，会议用车组成的长长的车队也让人烦恼不已。
The traffic jams here are very annoying.
这里的交通真是烦人。
The traffic jams here are very annoying.
这里的交通真是烦人。
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