of labor的用法和樣例：
例句
- His hard hands and sinewy sunburnt limbs told of labor and endurance.
他粗糙的雙手，被太陽哂得發黑的健壯四肢，均表明他十分辛勤，非常耐勞。 - I'm a federal employee. I work for the Department of Labor.
我是聯邦政府的僱員，我在勞工部工作。 - There is a clear division of labor in ants.
螞蟻間有明確的分工。 - It takes a lot of labor to build a railway.
修築一條鐵路要花費許多勞動力。
