n.卫生球，樟脑球
vt.封存
adj.后备的
This is a when strengthen mothball force construction important facet.
这是加强后备力量建设的一个重要方面.
Our country population is numerous, per capita has farmland amount low, and mothball resource lack.
我国人口众多, 人均占有耕地数量低, 且后备资源缺乏.
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