strengthening

名词 strengthening:

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

动词 strengthen:

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

1. A framework to support or strengthen a mine or shaft.
   井壁基架用来支承或加固矿井的构筑
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.
   俯卧撑锻炼手臂肌肉的运动，运动时脸部朝下卧着并把手掌撑在地面上并且用胳膊推动身体上下运动