碎石土的一种，岩石经水流或冰川搬运而成的略具圆形的石块。粒径为200～800mm。
成都地铁一号线一期工程区间隧道大多通过富水砂卵石地层，且含有少量大粒径漂石。
The first stage project of line 1 of Chengdu Metro mostly passes through water-rich sandy cobble ground, which contains a small amount of large boulders.
我理解的大意是：这就是说，一个个性人的存在就像一条河，开始很小，勉强地包在她的岸中，充满热情地冲刷漂石、越过瀑布。
It is said that, an individual human existence should be like a river - small at first, narrowly contained within its Banks, and rushing passionate past boulders and over waterfalls.
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