potance file

例句：

1. 1.The strength of the material is measured in kg/mm².
   材料的强度以千克每平方毫米为单位测量。
2. 2.The strength of the nation's economy has been weakening recently.
   该国经济的力量最近一直在减弱。
3. 3. The strength of the team was evident in their performance.
   团队的实力在他们的比赛中表现得很明显。