上上

She was jumping up and down.

她下下地蹦着。

Most teachers hold that students will come to no great harm if they go to a discotheque now and then.

大多数教师认为学生们偶尔迪斯科舞厅并无大害。

Our employee can communicate with all levels of staff in American Airlines and his work will be recognized by all levels of staff as well, which is a treasurable corporate culture.

在美航工作，可以下下同事通，更可以让工作会被下下同事认可，这是一种很珍贵企业文化。