phenomenon

　　In the face of sub-zero temperatures and freezing winds, New Yorkers braved the cold and went bare-legged for the annual 'No Pants Subway Ride' on Sunday.

　　上周日是一年一度的“地铁无底裤日”，尽管气温在零度以下、寒风凛冽，纽约客们却勇敢的挑战严寒，露出大腿来庆贺这个日子。

　　Wearing hats, scarves and thick coats on their top halves, boarded trains at stations across the city - surrounded by bemused travellers.

　　参加庆贺的人都头戴冬帽，裹着围巾，上身穿着厚实的外套，他们在全城各个地铁站上车——周围的乘客们对他们嗔目结舌。

　　Scantily-clad riders also took part in places including London, Milan, Bucharest, Berlin and Mexico City - all joined in as part of the 'celebration of silliness'.

　　在伦敦、米兰、布加勒斯特(罗马尼亚的首都)、柏林和墨西哥等地也有穿得太少的地铁乘客参加庆祝，他们在为人们的“傻瓜行为”共同庆贺。

　　It started off as a prank by comedy group Improv Everywhere in 2002, bemusing a few embarrassed commuters, but has since grown into a global phenomenon.

　　这个节日起源于2002年一个名叫“随处即兴”的搞笑团体策划的一场恶作剧，他们捉弄了几个地铁乘客，令其尴尬不已。现在，这一活动已经发展成为一种世界性的社会现象。