It takes four persons to play bridge.
桥牌要四个人玩。
In each, 120 different transects are carried out by four to six teams of three-persons each, each transect lasting four days (so roughly each group completes 30 transects or so).
它们的任务是对120个截面进行调查。每个调查持续四天(因此每个小组大约要完成30个截面调查)。
It was thus that the phantom which had been called M. Madeleine vanished from M. sur M. Only three or four persons in all the town remained faithful to his memory.
这个一度称为马德兰先生的幽灵便这样在滨海蒙特勒伊消逝了。全城中，只有三四个人还追念他。
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