Backflooding
地下水逆流
🗣️ 情景例句
Good morning, Mom.
早安 ，妈妈。
In university, students are trained to become teachers and engineers.
大学的学生被训练成为教师和工程师。
Such creatures have rarely been seen alive by man as they live at a depth of six hundred feet.
人们很少能看到活着的这类动物，因为它们生活在600英尺深的水下。