...(1)任意两点恰同时出现在一个区组中;(2)区组集可以划分为一些子集只(i∈n每个只是点集x的一个划分(称只为平行类(parallel class)).
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点集V的划分称为平行类。
参考来源 - A packing (resp. covering) is called resolvable if its block set admits a partition into parallel classes, each parallel class being a partition of the point set V. Denote by RP(K,λ;υ,m) (resp.·2,447,543篇论文数据，部分数据来源于NoteExpress
引起人们更多好奇心的是，正如德萨尔乐研究小组发现的一样，这些简单动物属于这样一类有机体，它们与那些后来演变为人类的生物体是平行进化的。
More intriguingly, these simple creatures belong to a group of organisms that, as DeSalle's team discovered, evolved in parallel to those that later developed into humans.
手套：黑色真皮或皮革类材料，长及前臂的一半处。上部为有内衬垫并有与手臂平行纵向缝合线。
Gloves: Black leather or leather-like material, mid-forearm in length. The upper surface is quilted in lines running parallel with the arm.
本文给出了一种新型双偶极子型宽带印制天线，并设计出相应的类平行宽边耦合双线双面馈电结构。
A new type of broadband printed twin dipole antenna is proposed in this paper. Corresponding feed structure of broadside coupled parallel line is also designed.
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