work force的用法和樣例：
例句
- Half of its work force is employed in agriculture.
半數勞動力從事農業工作。 - The farm labour force is running down steadily.
農場里的勞動力在不斷減少。 - The work force is growing with the influx of youngsters.
隨著年輕人的投入，勞動大軍正在發展壯大。 - A number of women are now leaving the work force to become full-time homemakers.
許多媽媽正離開勞動大軍，回家做個全職母親。
