slug two phase flow

例句：

1. 1.The slug was crawling across the grass.
   蜗牛正在草地上爬行。
2. 2. Scientists are studying the behavior of slugs in their natural habitat.
   科学家们正在研究蜗牛在自然栖息地的行为。
3. 3. The slugs were a sign of spring, as they emerged from their winter hibernation.
   蜗牛的出现预示着春天的到来，因为它们从冬眠中苏醒了。