劳动适龄人口的英文：
labor force
n. 劳动；工作；劳工；英国工党
v. 劳动；费力地前进
It is a scientific labor.
这是一项艰巨的科学工作。
He is satisfied with your labors.
他对你干的活儿很满意。
Genius is nothing But labor and diligence.
天才不过是勤奋而已。
Their labor efficiency is very high.
他们的工作效率很高。
The laborer is worthy of his hire.
做工的人应得其报酬。
n. 军队，暴力
v. 强迫，用力推动
by (main) force
用蛮力, 全靠气力; 以最大的力气
The force is spectacular!
这个瀑布很壮观！
resultant force
合力
The threat will force greater dispersion of their forces.
恫吓将迫使他们把兵力铺得更广。
The tension force, shear forces (including pushing force, cutting force and friction force), impulse force, hydrodynamic drag on the suction pipes, and the force resulted from the pressure difference, etc, are the main forces for detail discussion in this paper.
详细讨论了主要作用力：在波浪补偿器作用下的缆绳拉力、耙头与海床间的土壤剪切力、作用在耙吸管上的水流阻力及由于压力差在耙头处产生的推动力等。