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Its shielded box should be used the main air gap and prevent the primary current to produce the magnetic field concentrating in the shield shell metal plate.
其屏蔽盒应用主气隙，防止原电流产生的磁场集中在屏蔽壳的金属板内。
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The photodiode is placed in an electrically shielded dark box.
该光电二极管安放在一个电屏蔽的暗箱中。
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