The physical property of oscillator driven by quasi-constant field is studied.

研究了准恒场驱动谐振子的物理特性。

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The projection optics is designed for a constant field angle and entrance pupil. Thus image always fills entrance aperture and view field of the test optical system.

从光学指标的确定，结构、材料的选取到最终光学性能，阐述了准直投射光学系统的设计。

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A constant field in a class is similar to a global or function constant, except that it is scoped to the class and it can have various modifiers governing its visibility and usage.

类中的常数字段类似于全局或函数常数，不同的只是它的作用范围是该类，而且它可以用多个修饰符来指定其可见性和用法。

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The one historical constant in my field is that each time a claim of human uniqueness bites the dust, other claims quickly take its place.

WSJ: The Brains of the Animal Kingdom

Barely 5ft 9ins and less than 13 stone, he's a midget in a land of giants, but what he lacks in size he more than makes up for with mouth, a constant chatterbox on and off the field, fired by a perceived sense of injustice at the way his country has been treated by the rugby elite.

BBC: Argentina's new hero

At that age, teammates play all the positions, and Martin, with a near-constant grin, was happy anywhere on the field, Mr. Calderon said.

WSJ: In Boston Neighborhood, Shock at Death of 8-Year-Old