So when a firm called Virgin Galactic announced in 2004 that it was planning commercial space flights there was, not surprisingly, some scepticism.
所以，当2004年维珍银河公司宣布计划进行商业太空飞行时，有一些怀疑之声也并不奇怪。
Vector space also called linear space, it is composed of by many vector and comply with some specific operation rule collection.
向量空间也叫线性空间，是由许多向量组成的并且符合某些特定运算的规则的集合。
Vector space also called linear space, it is composed of by many vector and comply with some specific operation rule collection.
向量空间也叫线性空间，是由许多向量组成的并且符合某些特定运算的规则的集合。
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