死亡谷是一片沙漠平原，是加利福尼亚的一个干涸的湖床，四周群山环绕，在沙漠的地面上有巨大的岩石，有些重达数百磅。
Death valley is this desert plain, a dry lake bed in California surrounded by mountains and on the desert floor these huge rocks, some of them hundreds of pounds.
考察了风量、小麦初始含水率、收获日期和逐年气象条件的变化以及谷床厚度等因素对北京地区小麦低温干燥的影响。
The influences of airflow rate, initial moisture content, harvest date, year to year variation of weather conditions and grain bed depth on the drying performance were investigated.
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