The killers threw him into a ditch and covered his body with a thin layer of soil in an attempt to hide the body.
杀人者将他扔进一条壕沟内，然后在他的身上埋上了一层薄土，试图掩藏他的尸体。
It is this thin layer of active soil that supports all living things on the tundra.
正是这被太阳晒暖的苏醒过来的薄薄的一层土壤养活着冻土带上的一切生物。
During the brief summer, a thin layer of frozen soil thaws at the surface.
短短的夏季里，表面很薄的一层冻土融化了。
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