This also means that the old values are still present in the field of the old type.

这还意味着，旧的值仍然保留在旧类型的字段中。

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In other words, if the set of possible values of the new type is a superset of that of the old type, then you have expanded the type.

换一种说法，如果新类型的可能值是旧类型的超集，那么您就已经对类型进行了扩展。

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A house garden is an old type of classical gardens. It enables people to contact nature and improve their living conditions.

宅园是一种十分古老的园林类型，它对于人们接触自然，改善生活环境具有特殊的意义。

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But since these products can be patented (and many face little competition), companies can charge prices hundreds of times higher than those for the old type of vaccine.

ECONOMIST: Vaccines

My therapist, an old fashioned type who practiced in Cambridge, Mass.

FORBES: Density Of Meaning: Creation As The Flip Side Of Memory

It wants to hear from anyone who may have seen an old-type blue Ford Escort van near the beach, popular with dog walkers, on Monday evening, when the killings are believed to have taken place.

BBC: Inspector Lynn Williams at Afonwen beach