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.
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.
滇西（怒江以西）地区分布着数十个新生代盆地，且多为小型山间盆地。
Tens of Cenozoic basins, mostly small-sized in tramontane basins, are dispersely distributed in western Yunnan (west to Nujiang ri ver).
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