常言说治病不如防病,对待堤坝亦然。拉斯卡先生发明的第二种装置就是用于事先防止堤坝出现垮塌。这
In this case the acronym of choice is REPEL.
种装置的全称是泥土坝便置保护装置,其英文首字母的缩略语REPEL也正好有防御的意思。
REPEL is made of the same material as PLUG, but instead of being thrown into the water andcarried to its destination by the current,
它与第一种装置使用同样材料制作,但不是要把它投入河中由水流带到裂口处。
it is laid out flat on a levee that is in danger of being overtopped and thus eroded by theriver it is supposed to contain.
一旦河水猛涨漫过堤坝就会对泥土坝造成冲蚀,危及堤坝的安全。此时可以把REPEL铺在堤坝顶上保护堤坝。
In normal circumstances merely placing a layer of protective material on top of a levee inthis way would not do much good.
一般来说如果只是这样在堤坝顶部铺一层类似的保护材料在漫坝时不会起到什么作用。
The force of the water would quickly wash it away.
水流的力量会很快将它们冲掉。
However, REPEL has a series of tubes that sit on top of it and can be pumped full of water in amanner similar to that employed by PLUG.
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