This vector is called a normal vector or normal for short.
这一向量就称为法线向量或简称为法线。
In general, reservoirs are at normal or above-normal levels for this time of year.
一般情况下，一年的这个时候，水库的水位都会处在正常或高于正常水位线。
In general, reservoirs are at normal or above-normal levels for this time of year.
一般情况下，一年的这个时候，水库的水位都会处在正常或高于正常水位线。
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