... centre 只用于空间，而 middle 既可以用于空间，也可以用于时间或活动等。如： in the middle of September 九月中旬 in the middle of dinner 正在吃饭 ...
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我进去时他们正在吃饭 They were at table when I went in
我现在正在吃午饭 I am now eating lunch ; I eating lunch now ; I'm trying to eat lunch
我正在吃午饭 I was eating lunch ; I am currently eat lunch ; I'm eating lunch
他们可能正在吃午饭 They may be eating lunch ; They are possibly eat lunch
妈妈正在吃早饭 Mother is eating breakfast ; Mom is eating breakfast ; My mother is eat breakfast
我正在外面吃饭 I'm eating out ; I'm out to eat
我们正在吃早饭 We are now eat breakfast ; we are having breakfast
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