vacuum technique

例句：

1. 1. The company uses a vacuum technique to remove impurities from the gas.
   该公司使用一种真空技术来从气体中去除杂质。
2. 2. The vacuum technique is crucial for maintaining the cleanliness of the environment.
   真空技术对于保持环境的清洁至关重要。
3. 3. In this experiment, we applied the vacuum technique to test its effectiveness.
   在这个实验中，我们应用了真空技术来测试其有效性。