举国上下

the whole nation

上下之间的关系

relationship between the higher and lower levels

上下通气

have communication between higher and lower levels

上下打量

look somebody up and down

上下移动

move up and down

上上下下都给雨淋湿了

soaked from head to foot

价格不相上下。

There isn't much difference in price.

他们的成绩难分上下。

They all achieved roughly the same.

１０００人上下

about 1000 people

４０岁上下

around 40 years old

温度在零度上下

the temperature is around freezing

上下楼梯

go up and down the stairs

山上修了公路，车辆上下很方便。

A road has been built up the mountain, so it's easy to go up and down by car.