But daily vertical movements by zooplankton in the ocean—upward by night to seek food, downward by day to escape predators—can also be considered migration.

但是海洋中浮游动物每天的垂直运动——夜里上浮以寻找食物，白天下潜以躲避捕食者——也可以被视作迁徒。

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In the process of playing the piano, there should be a harmonious unity between relaxation and concentration, between dropping and supporting, between horizontal movements and vertical movements.

钢琴弹奏过程中，放松与集中，下落与支撑应有机统一，水平运动与垂直运动应协调配合。

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In the process of playing the piano, there should be a harmonious unity between relaxation and concentration, between dropping and supporting, between horizontal movements and vertical movements.

钢琴弹奏过程中，放松与集中，下落与支撑应有机统一，水平运动与垂直运动应协调配合。

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