各种社会势力的英文：
social forces
adj. 社会的；群居的；合群的；社交的
n. 联谊会；社会聚会
A social debut.
首次进入社交界，首次演出
Slavery was once socially sanctioned.
奴隶制曾经为社会所认可。
social service facility
社会服务场所
Man is a social animal.
人是群居的动物。
She has a social nature.
她天生合群。
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。