When the front bird moves its wings up and down, the resulting force of the air lifts the next one.

当前面的鸟上下移动它的翅膀时，产生的空气力会带动下一只鸟。

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An exhale is sent down through each four corners of the foot, pressing it firmly onto the ground and an equal force is now pressing back up and through the front thigh, opening the front of the hips.

呼气时，顺着脚的四个方向慢慢向下俯身，稳稳地压在地面上，然后用力将后背沿着前大腿推起，打开胯部。

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This paper discusses the character of electromagnetic force in the molten aluminium: the traveling magnetic force cuts the solidifying front to break down the growing columnar crystal;

探讨了组合电磁场对铝熔体的作用性质：行波磁场力对凝固前沿作微切割，使成长中的柱状晶碎断；

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But just a minute later another Scottish scrum felt the full force of the Italian front-row and prop Euan Murray was penalised for bringing down his opposite number.

BBC: Italy 23-20 Scotland