名詞 strengthening:

1. becoming stronger
2. the act of increasing the strength of something

動詞 strengthen:

1. make strong or stronger
   同義詞：strengthen, beef up, fortify
2. gain strength
   同義詞：strengthen
3. give a healthy elasticity to
   同義詞：tone, tone up, strengthen

1. A framework to support or strengthen a mine or shaft.
   井壁基架用來支承或加固礦井的構(gòu)筑
2. An exercise for strengthening arm muscles performed by lying face down with the palms on the floor, and pushing the body up and down with the arms.
   俯臥撐鍛煉手臂肌肉的運(yùn)動，運(yùn)動時臉部朝下臥著并把手掌撐在地面上并且用胳膊推動身體上下運(yùn)動