Use abstract fields instead or convert the trait to a class with a constructor.

使用抽象字段，或者把这个trait转换成一个有构造函数的类。

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Code fields may use an abstract set of alphabetic values.

代码字段可能使用字母值的一个抽象集。

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Nor is it because he championed the abstract idea of fields, a fecund notion that underpins much of modern physics.

这也不是因为麦克斯韦提出了支撑了大部分现代物理学的场理论。

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Leadership and far-sightedness are not general, abstract qualities, but specific to particular tasks and fields and times.

FORBES: The Far-sighted Leader

As I watched more and more games I began to recognize that the little armies of pieces operate like fields of force, and top level games are abstract, deeply nuanced and emotional works of art.

FORBES: Magazine Article