Most people spend about half an hour at a time, and two hours total.
大多数人一次性花半小时，分四次共两个小时。
It takes me an hour and a half to cook two dishes and a soup.
我花了一个半小时，煮了两菜一汤。
I bought two expensive dictionaries here half and hour ago.
半小时以前我在这里买了两本很贵的辞典。
I bought two expensive dictionaries here half and hour ago.
半小时以前我在这里买了两本很贵的辞典。
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