The sea is down . |  海平面下降了。  | She is always at the bottom of the class . |  她总是在班上垫底。 
I left my dictionary downstairs . 我把字典落在楼下了。 
When we looked down , we saw many buildings . 当我们往下看时,我们看到了许多建筑物。 
The bridge is far down the river . 桥在河下游很远的地方。 
We ran down the hill . 我们跑下山。 
I have looked for it up and down . 我上下都找过了。 
The post office is down the street . 邮局就在街那头。 
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