We believe that a force of about one hundred pounds was needed to pull the string all the way back on a long bow.

我们认为，拉动长弓上的弓弦大约需要100磅的力。

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This is one major trend raising the level of education required for a productive role in today's work force.

这是提高在当今劳动力中发挥生产作用所必需的教育水平的一个主要趋势。

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The structure of many poor women's work—often a labor force of one in an employer's home—makes it difficult for them to organize to improve their economic conditions in general.

许多贫穷妇女的工作结构——往往是雇主家中的劳动力——使她们难以组织起来改善总体经济状况。

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She also linked it to a one to two point increase in the number of women in the labor force.

VOA: special.2010.03.04

Gravity is one force that acts on a body without the source of the force actually touching it.

引力是一种受力物体收到了力的作用,但却没有接触施力物体的力

耶鲁公开课 - 基础物理课程节选

We can be precise about how much bigger by saying, "If the acceleration of a body to a given force is ten times that of a one kilogram mass, then this mass is one-tenth of one kilogram."

我们能精确地知道质量能大多少,只需要说,"如果物体在给定力作用下的加速度,是一个 1 千克物体的加速度的 10 倍,那这个物体的质量就是 1 千克的十分之一"

耶鲁公开课 - 基础物理课程节选

There are obviously a number of complicated logistics involved with moving Air Force One, moving a plane of reporters, events, local stops, phone calls involved.

WHITEHOUSE: The White House

Picture the gold price as a pulley with gold company executives applying force on one side of a rope.

FORBES: Gold Miners Can Do Much Better Than Price Of Gold

It quickly established its mastery of the new media ecosystem with a video hoax that showed designer Marc Ecko spraying graffiti on Air Force One, one of the first instances of viral marketing on YouTube, then only a year old.

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