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。
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。
Some movements involving primarily vertical or horizontal motions of the body as a whole, in which rotations can be ignored, can be studied using simple equations of linear motion in three dimensions.
有些运动主要涉及整体的垂直或水平运动，其中转动可以忽略，可以用三维线性运动的简单方程来研究。
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