风力

wind force

牵引力

traction

力函数

force function

推动力

driving force

说服力

power of persuasion

理解力

comprehension

药力

strength of medicine

两腿无力

have no strength in one's legs

力不足

have not enough strength

力排众议

override all objections

力持异议

stand one's ground

力戒骄傲

put aside one's pride

力主修改方案

insist on modifications

工作不力

be ineffective in one's job