This leads to the result that the work of force counteracts the work of damp force, and that the swing of steadily oscillation is the same.

正是有这一相位差，才使强迫力对振动系统所做的功正好抵消阻尼力对振动系统所做的负功，以保证稳定振动的等幅性。

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When the economic depression began in eighteen ninety-three, George Pullman cut the size of his work force.

VOA: special.2010.06.24

But it's those kinds of questions that, there's a little bit of spark, there's a little bit of a powerful force and there's just a lot of hard work to get from here to there.

但是问题是，那时候已经产生了一些火花，一些外在动力,只不过达成目标还需要大量的艰苦工作。

斯坦福公开课 - 微软CEO-Steve.Ballmer谈科技的未来课程节选

sort of changed, when I got into the work force to trying to work on, international issues.

当我进入工作社会， 我想做与国际事务有关的工作。

换专业的理由 - SpeakingMax英语口语达人

Today, it has 300 people, out of a total work force of 3, 500, monitoring spam, resetting users' passwords and flagging user complaints to higher-level executives.

WSJ: Facebook's New R&D Machine

Headquarters staff numbers only 80, a tiny fraction of Ahold's worldwide work force of about 350, 000 (including U.S. Foodservice's).

FORBES: The Anti-Wal-Mart

Electric car manufacturer BYD Company said it will lay off 70% of its work force after poor reviews of its vehicles added to the current sales slump, the Shanghai Daily reported on Wednesday.

FORBES: Significant Layoffs Coming At Buffett's China Auto Co BYD