strength timber

例句：

1. 1. The strength of the material is measured in pounds per square inch.
   材料的强度以每平方英寸磅数来衡量。
2. 2.The strength of the economy depends on the availability of resources.
   经济的强弱取决于资源的可用性。
3. 3. The strength of the muscles can be tested by lifting weights.
   肌肉的力量可以通过举重来测试。