马上她又打开冰箱约三分钟。
Immediately afterward, she opened the refrigerator door for almost three minutes.
小组每个人应计画发言约三分钟。
Each person in each group should plan to speak for approximately 3 minutes.
我只花了约三分钟的录影带，是我向他出示了怎样做。
It only took me about 3 minutes in one of my videos to show him how to do it.
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