Information on the behaviour of Marburg virus once it enters a human population is sparse.
关于马尔堡病毒一旦进入人群的行为的信息贫乏。
Population data for most of the world's 35 seahorse species is sparse.
世界上35种海马中大多数的种群数据都非常稀少。
The basic characteristic of population distribution in China is dense in the southeast and sparse in the northwest.
东南部人口稠密，西北部人口稀少是我国人口分布的基本特点。
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