小型水库分布区域广，且多为均质土坝。

Minitype reservoir distributes area being a homogeneity earth dam broad, and many.

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主要发生在< 1岁儿童，且多为首次服苗后。

VAPP mostly occurred in children< 1 year old after one dose of OPV vaccine.

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影响矿山压力计算的因素有很多，且多为不确定性因素。

There are many factors to affect the calculated result of roof pressure, and most of them are non-determined factors.

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