His knowledge of mathematics is superficial and scanty.
他的数学知识浅显、贫乏。
His knowledge of mathematics is superficial and scanty.
他的数学知识浅显、贫乏。
Abstract : In dry area or sandy dryland, for the reason of scarce rainfall, windiness and lack of labor power and material resources, the low survivor ratio of afforestation were common.
摘要 ： 在干旱或荒漠地区造林，降雨稀少，
大，加之人力、物力的贫乏等原
，导致造林成活率低。
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