This is an approach to crop production that is based on three principles: permanent soil cover, minimum soil disturbance, and crop rotations or crop associations.
保护性农业是一种作物生产手段，它基于三个原则：永久性土被，最低土壤干扰，以及轮作或作物关联。
The news release, echoed by the news media, claimed that Greenland had lost 15 percent of its permanent ice cover from 1999 to 2011.
由媒体发布的新闻稿，一再声称从1999年到2011年，格陵兰岛丧失了15%的永久冰雪覆盖。
With analysis lo-Mg-Al alloy composition C5M4 and of reasonable smelting, heat treatment, permanent casting and other technological measures qualified EMU motor cover can be produced.
通过对合金成分分析，采取合理的熔炼、热处理、金属型铸造等工艺措施，能生产合格的动车组用电机端盖。
The utility model relates to a novel magnetic water drinking appliance, comprising a cup body and permanent magnetic bodies which are installed on a bottom part, a top cover and a cup wall.
本实用新型涉及到一种新型饮用磁化水用具，它是由装在底部、顶盖、杯壁的永磁体和杯体本身组成。
The utility model relates to a novel magnetic water drinking appliance, comprising a cup body and permanent magnetic bodies which are installed on a bottom part, a top cover and a cup wall.
本实用新型涉及到一种新型饮用磁化水用具，它是由装在底部、顶盖、杯壁的永磁体和杯体本身组成。
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