life is only a test／人生只是一场考试 lower your height／降低人生高度 the addition。subtraction，multiplication and division of life／人生的加减乘除 .
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When you work at a computer, the keyboard should be at elbow height, so your upper and lower arms form an Angle of 90 degrees or more and your forearms are supported by armrests.
当你在电脑前工作时，键盘应该和肘部齐高，这样你的大臂与小臂成90度角或更大的角度，小臂可以放在椅子扶手上。
Putting your head at the same height or lower than your heart gets blood to your brain faster — and makes those blasted spots go away.
低下头与心脏平齐或更替可以让血液更快的流到大脑中，让消除血栓。
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