trench test

例句：

1. 1. The company conducted a trench test to evaluate the effectiveness of their new product.
   该公司进行了一个隧道试验，以评估其新产品的有效性。
2. 2. During World War II, many countries conducted trench tests to determine the feasibility of underground living.
   在第二次世界大战期间，许多国家进行了战壕试验，以确定地下生活的可行性。
3. 3. The trench test revealed that the new technology could significantly improve efficiency in manufacturing processes.
   战壕试验显示，新技术可以显著提高制造过程的效率。