英语
西班牙语
英语
西班牙语
英语
西班牙语
单语范例（未经PONS编辑处理）
The void under the dam was plugged by adding fill material to the river below and upstream of the dam.
en.wikipedia.org Behind the dam, where the reservoir existed, is now full of silt with the exception of directly behind the upstream face which has been excavated.
en.wikipedia.org Eyewitnesses saw the airplane descend upstream along the river.
en.wikipedia.org If the shunt is not flowing, the cooled fluid remains upstream and no temperature drop is recorded.
en.wikipedia.org Further he suggested that streams always have at least some gradient and temporary base levels, such as inland-lakes, are controlling points upstream of them.
en.wikipedia.org