wave wet sand
波浪湿沙
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Just when they had nearly finished their project, a big wave came along and knocked it down, reducing it to a heap of wet sand.
在他们几乎就要完工之时，一个大浪打来将其击倒，使其变成一堆湿沙。
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