Focal length is the distance between optical centre and principal focus.

焦距就是镜片中心和焦点之间的距离.

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Without doubt the principal focus that low power design already became IC to design.

毫无疑问低功率设计已成为IC设计的首要重心.

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I had taught in Wah Yan College , but it was not my principal focus of interest.

我在华仁教书, 并不是我主要兴趣焦点.

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