问题描述：
一分半 一个半小时这种表达中 minute 和 hour 要加s
e.g.1.25 hour
or 1.25 hours
what about 2.25 hour.
some explanations would be appreciated~
e.g.1.25 hour
or 1.25 hours
what about 2.25 hour.
some explanations would be appreciated~
问题解答：
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