Between 17, 500 and 25, 400 feet in elevation, the snow and soil samples they tested exceeded the U.S. Environmental Protection Agency's tolerance levels for both arsenic and cadmium.
他们测试了海拔17500到25400英尺之间的积雪和土壤的样本，发现这些样本的砷和镉都超过了美国环境保护局的标准。
His feet left prints in the soft soil.
松软的泥土上留下了他的脚印。
Soon after getting his pilot's license, my husband was talking with my uncle Olson, a farmer with his feet firmly planted in the soil.
在拿到飞行员执照以后不久，我丈夫正与我的叔叔奥尔森交谈，奥尔森叔叔是面朝黄土背朝天的农民。
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