上下

1. high and low

♦ 全军~ the whole army, officers and men alike

♦ ~通气 full communication between the higher and lower levels

♦ ~一条心。 The leadership and the rank and file are of one mind.

2. from top to bottom; up and down

♦ ~打量 look sb. up and down; scrutinize sb. from head to foot

3. relative superiority or inferiority

4. (used after round numbers) about; or so; or thereabouts

♦ 四十岁~ about forty years old; forty or so

5. go up or down

♦ 山上修了公路, 汽车~很方便。 With the completion of the highway up the mountain, cars can easily go up and down.