This is because when we wear shoes, certain amount of pressure is exerted on the toes due to which the toenails fail to grow normally.

这是因为当我们穿着鞋的时候，一定量的压力就落在了脚趾上，致使脚趾甲不能正常生长。

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At the same time in which the joints due to fractured, there are different sizes of fissures or faults, leakage of water has a certain pressure.

同时由于在该段节理裂隙发育，有大小不等的裂隙或断层，渗漏水有一定的压力。

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If, as a living doormat, valve damage, or due to other reasons, led to pressure to increase exports and to permit more than a certain value, the safety valve will automatically open the exhaust.

如果由于活门垫、活门损坏或由于其它原因，导致出口压力自行上升并超过一定许可值时，安全阀会自动打开排气。

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During the dive, which takes up to four hours due to the high density of the water (it is filled with certain chemicals plus air pressure to simulate the circumstances found in space), the cosmonauts in training practice space walking -- and may lose a few kilos off their waist line in the strenuous process.

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