roughing vacuum pump

例句：

1. 1. The roughing vacuum pump is used to remove impurities from the gas before it reaches the final stage of purification.
   粗真空泵用于在气体到达最终净化阶段之前去除杂质。
2. 2. The roughing vacuum pump is essential for maintaining the cleanliness of the process chamber during the manufacturing process.
   粗真空泵对于生产过程中保持工艺腔体清洁至关重要。
3. 3. The roughing vacuum pump was designed to handle high-pressure and high-temperature conditions, making it ideal for use in harsh environments.
   粗真空泵设计用来处理高压和高温条件，使其非常适合恶劣环境使用。