This results in alternating periods of quiescence and activity - remarkably like the build-up and collapse of a sand pile.

这会导致变换的静止和活动的周期-与沙堆的堆砌和崩塌非常相像。

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They could see the grass-thatched shed lift and collapse, while a froth of foam cleared the crest of the sand and ran down to the lagoon.

他们瞧见那棚屋的草顶往上一掀，坍塌下来，一道溅着白沫的波浪越过沙堤，流进湖内。

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A series of measures such as open caisson, thickening protective wall and decreasing length, etc. are taken to overcome problems of sand drafting, collapse and water gushing, which get better effect.

施工中采用沉井法、增加护壁厚度、减小长度等一系列措施，克服了流砂、坍孔、涌水等难点，取得了较好的效果。

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Whether from natural catastrophes, economic collapse or the slow encroachments of sand or water, it seems likely that at least some of today's cities will meet the same fate as Ozymandias, the king of kings who built a monument to himself.

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