提出了一种数学模型来描述试验中沟宽的周期性形态变化。
A mathematical model was advanced to describe these changing patterns of rill width.
唯一能把她家用来过暑假的房子和大火分开的就是她和她父亲自己挖的一条不到一米宽的沟。
The only thing that separates her family's summer home from the flames, is a less than one-meter wide trench she and her father dug themselves.
把每条沟挖宽也无结果。于是，开挖六天后，他们转向两座有标识墓穴之间的一个新地点。
Widening each trench proved fruitless, so on the sixth day of digging, they moved to a new site, between two marked graves.
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