He looked out over the valley, then down at the papers in his hand.

VOA: special.2009.11.12

if you've got a hill or valley and there's a cart on wheels it's going to go down to the bottom.

如果我们有一座山或者山谷，并且,有一个有轮子的车，这辆车会自动滑到底部。

麻省理工公开课 - 热力学与动力学课程节选

In the case here, tha t I just illustrated with the little cart going down the valley, would be exactly the same with regular energy, the equilibrium state is one of lowest energy, right.

在现在所考虑的情况下,我刚才所描述的小车沿着山谷下行，结论会像能量判据一样，平衡态是能量最低的态。

麻省理工公开课 - 热力学与动力学课程节选

Further down in the valley they found the body of its unlucky owner.

VOA: special.2009.06.06

He rode his horse down the mountain toward the valley.

VOA: special.2010.07.10

Town leaders said any floodwaters coursing down the mountain would flatten out once they reached the valley.

VOA: standard.2010.04.26

The deal was widely seen as surrender to Taliban control of the valley, but it collapsed after militants refused to lay down arms and moved into neighboring districts to expand their influence.

VOA: standard.2009.07.26

The military is trying to complete a two-month offensive to dislodge Taliban fighters in the Swat Valley region, and will soon begin a similar operation to hunt down top Taliban leader Baitullah Mehsud in South Waziristan.

VOA: standard.2009.07.04

Officials say the deals have shown to the Pakistani public that while the government has honored its commitment to militant demands for Islamic courts in Malakand, the militants still have not put down their weapons or halted their expansion beyond the Swat valley.

VOA: standard.2009.04.27