当你穿过忙碌的街道时要小心。
Be careful when you walk across the busy street.
youdao
在交通忙碌的街道上开快车，实在是太危险了。
It's too dangerous to drive fast on busy streets.
交通警察总是十分忙碌，特别是在繁忙的街道。
Traffic police are always very busy, especially at busy streets.
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