Changing money on the street is illegal – always use a bank.

在街头兑换货币是非法的–始终要去银行。

《柯林斯英汉双解大词典》

In 2004, with illegal street racing becoming a problem on the streets of Sydney and Melbourne, Tranter and Warn focused on young drivers.

2004年，随着非法超速成为悉尼和墨尔本街道安全的一大隐患，泉特和王把注意力放在了年轻驾驶者身上。

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Other health dangers facing adolescents include tobacco, alcohol and other drug misuse, their exploitation as cheap and often illegal Labour, and the worrying growth in the Numbers of street children.

对青少年的健康危害还包括：烟草，酒精和药物滥用，被廉价的剥削和常常作为非法劳工，以及令人担忧的不断增长的街头流浪儿童的数量。

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Also,because it is illegal to paint public and private property without permission, street artists usually work secretly.

VOA: special.2009.04.08

The police are not convinced but they know stopping illegal street racing is virtually impossible.

BBC: On the trail of street racers

Outside of the pieces specifically authorised by local councils and property owners, street art is illegal.

BBC: The artful dodgers of Melbourne��s graffiti revolution

The Malaysian government said Mr Xenophon had taken part in an illegal street protest for electoral reform last April.

BBC: Australia PM 'disappointed' at Malaysia deportation