"I have agreed in principle to a new British force level of 9,500, which will be put into effect once these conditions are met,".

VOA: standard.2009.10.14

Therefore, what we have done now is, we can take all kinds of springs and we can calibrate the force they will exert under various conditions.

因此,我们现在能做到的就是,我们能处理各种各样的弹簧,我们能测出它们在不同的情况下,产生的力的大小

耶鲁公开课 - 基础物理课程节选

"The reason the unemployment rate rocketed it up, is because the improving employment conditions are drawing more and more job applicants into the labor force,"

VOA: standard.2009.11.06