她们哼笑一下，毫不犹豫奔向下一层。
The friends laugh and without hesitation move on to the next floor.
按下向下键时，应该显示弹出列表。
When the down key is pressed, the pop-up list should be shown.
他走到电梯旁按了一下“向下”的按钮。
Michael再次按下向下的按钮，是同样的结果。
我向下游远远的望了一下，看见水面上漂着一个黑点。
I looked away down stream, and saw a black speck on the water.
测量从肩顶，顺着肩膀前面向下到腋窝下，再从肩部的后面向上回到肩顶。
Measure from the top of the shoulder, down the front of the shoulder, under the arm pit, and up the back of the shoulder.
把绳子向下拉一下。
把绳子向下拉一下。
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