This simplifies creation of data types that use the same internal representation as an existing type.

这样同类的内部类型描述可以作为一个既有的类型，简化了数据类型创建。

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Type extensions, which enable you to extend an existing type easily without the additional overhead work of creating a new derived type.

型别扩充，可让您轻松扩充现有型别，而不需要额外建立新的衍生型别。

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The type option lets you replace an existing type tree file by selecting Overwrite file or replace existing types, and add new types by selecting Override type.

通过选择overwrite file或Replace existing types, type选项允许您替换一个现有类型树文件，并通过选择override type添加新类型。

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The second piece of evidence pointing to is the eccentric orbit of an existing planet around the star, which is in an orbit not normally expected in this type of system.

FORBES: Astronomers Discover A Star That May Have Destroyed Its Own Planet

Apple's challenge is that getting people to buy an iPod, a new type of device, is easier than getting them to switch loyalties in an existing product category.

ECONOMIST: The iPod has turned Apple into a superbrand

No one now knows how easy it would be to turbo-charge an existing human pathogen, or take one that infects another type of animal and assist its passage over the species barrier.

ECONOMIST: Synthetic biology