half an hour??

half an hour mean 半小時

half an hour=半個小時

2010-04-10 14:14:41 補充：
or 30 mins

Half an hour means half of an hour,=30mins

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half an hour
半個鐘

Half an hour mean半小時

或者half past one=1:30
one fourty=1:40
one fifty=1:50
quarter past one=1:15
one fifteen=1:15
one o one=1:01

Half an hour means "half of an hour", i.e. 30 minutes.

There are other instances where the "of" is omitted in similar usages. For example: half a year (has gone by), half a century (ago), half a tank (of gasoline), half a glass (of wine),

half an hour=半個小時