First focus the reticle with the image field boundary by turning the eyecup.

首先在图像的边界对准十字线旋转眼杯。

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The physics significance of electromagnetic field boundary conditions has been comprehensively discussed.

系统论述了电磁场边值关系的物理起源。

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A theoretical calibration method for potential system with electric field boundary element method was introduced.

文中提出了一种用电磁场边界元法对电位法进行标定的理论标定方法。

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She said it had been a challenging year as checks had discovered large numbers of field boundary changes.

BBC: Question Time

Cricket keeps an off-field umpire for boundary calls, and to ascertain whether batsmen are run out, and if catches are real.

ECONOMIST: Cheating in sport

The Sun's changeable magnetic field is generated at the boundary between these two layers, where strong electric currents flow.

BBC: Sun, Trace