test for equilibrium

例句：

1. 1. The engineer tested the new machine to ensure it worked properly.
   工程师测试新机器以确保其正常工作。
2. 2. Before starting the project, we must test the materials to make sure they are safe.
   在开始项目之前，我们必须测试材料以确保它们是安全的。
3. 3. The scientist conducted a series of tests to determine the optimal conditions for growth.
   科学家进行了一系列的测试来确定生长的最佳条件。