Also , they are filled with solidified magma that rose from the interior to fill the gaps , forming features geologists call dykes .
也因此,月球表面充满了从其内部涌出填满裂缝的凝固岩浆,形成了地质学家称为堤坝的现象。
With sea levels expected to keep rising , work to broaden coastal dunes and strengthen sea and river dykes is estimated to continue for another 100 years .
随着海平面持续上升,扩大沿岸沙丘和加强抵御海水、河水的大坝的工作大约要再持续100年。
They are now " depolderising " , removing or lowering the surrounding dykes and turning land back into floodplains .
他们正在“去除开拓地”,移开或降低周围大坝,把土地变成泛滥平原。
In the netherlands dykes have been pushed out and flood plains restored to give rivers more room to flood .
在荷兰,堤坝的位置被后移,保存了泛洪区,这样泛滥的河水就有更大的空间奔腾翻滚。
The country 's philosophy of flood control has as a result pivoted from building ever higher dykes to instead making its cities and countryside more resilient to floodwaters .
荷兰更愿意建立更高大坝而不是让城市和农村更能抗洪,该国控制洪水的理念可见一斑。
As cities on river deltas extract groundwater for industry , drinking and sanitation , the ground subsides , putting it further below sea level and thus requiring even higher dykes .
建在三角洲地段的城市抽取地下水为工业、饮用和卫生所用,土地下沉,离水平面更远因此需要更高的堤坝。
Some years later dykes resumed contact healey said and told her that the letter was " dictated by mark when he was out in the bush to an owens employee " and that the contents might have been garbled in transmission .
As the first line of defence , communities built sea walls with tsunami gates for river mouths that could be closed when waves approached , as well as offshore breakwaters and raised river dykes .