strength of pressure parts of boiler

例句：

1. 1. Thestrength of the material is what makes itdurable.
   材料的力量是它耐用的原因。
2. 2. Thestrength of the nation's economy hasbeen a major concern for years.
   国家经济的强度多年来一直是主要关注点。
3. 3. The strengthof 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。