We then show how to create custom fields by creating property sheet types and document types, how to create a document with custom fields, and how to update the values in the custom fields.

然后我们演示如何通过创建属性表类型和文档类型来创建定制字段，如何创建带定制字段的文档，以及如何更新定制字段中的值。

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To create custom fields, we must first create a property sheet type.

要创建定制字段，必须先创建属性表类型。

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The fields are named after the base property action to which they corresponded.

字段根据它们对应的基属性操作命名。

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In fact, there's a property of gravitational fields anywhere, even in outer space, but there is some residual field between all the planets and all the stars in the universe, that the force on a body is proportional to the mass of the body.

实际上,这是任何地方的引力场都具备的属性,甚至是在外太空,在所有的行星和恒星之间,存在着某种剩余场,在这个场里作用在物体上的力,和物体的质量之间存在比例关系

耶鲁公开课 - 基础物理课程节选

He added that none of his fields near to his property were suitable for keeping chickens.

BBC: Cockerel (generic)

Unlike the megaresorts of the 1950s, the 483-acre property feels more untouched than the fields around it.

CNN: Hot new things to do in Puerto Rico

Farmers in other parts of the country have dug trenches around their property and even hired mercenaries to guard their fields.

ECONOMIST: South Africa