To reduce leakage currents, use good quality insulators, reduce the level of humidity in the test environment, and use guarding.

为了降低泄漏电流，应当使用高质量的绝缘材料，降低测试环境中的湿度，以及采用保护技术。

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You must carefully choose insulation and apply guarding potentials, and you must use an amplifier with picoampere input-bias currents.

必须谨慎选择绝缘方法和使用保护电位，必须使用输入偏置电流为微微安级的放大器。

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About 450 troops and 1, 700 extra police officers began guarding Heathrow Airport on Tuesday, and the use of troops in the centre of London has not been ruled out.

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This is a product that is as easy to use as it gets, and provides a highly secure environment for your company laptops, deterring theft and guarding valuable data.

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It calls for limiting the use of U.S. forces to training the Iraqi military, guarding the border, fighting terrorists and protecting U.S. interests.

NPR: Primer: Amendments Aimed at Iraq Policy Shift