Keep your head and body vertical, and your feet firmly on the floor in front of you so your knees bend over your toes.

保持头部和上身竖直，你的双足平稳地放在你前方，从而让你的膝部弯过你的脚趾。

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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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You should also observe that the table has identical looking and equally serviceable horizontal and vertical headers that are distinguished from the table's body.

您还可以观察到表体之外有两个外观一样的标题栏，它们分别是垂直和水平的。

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The laws of physics will simply not permit Arnold Schwarzenegger, even as the Terminator, to carry a coffin, empty or otherwise, on one shoulder while the position of his body is, as shown, vertical.

ECONOMIST: Shining some light