单词：cover crop
cover crop的用法和样例：
例句
- European vetch much cultivated as forage and cover crops.欧洲的一种野豌豆，通常被用来制草料和覆盖作物。
- It is generally advantageous to sow pasture seeds with a companion grazing nurse crop.一般在播种草种时，同时播种放牧保护作物是有好处的。
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