Analyzed the limitation of protective earth and necessity of leakage protection for electric power plant.

进行了电站保护接地的局限性和漏电保护的必要性分析。

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The protective earth wire is mainly to reduce the strong electromagnetic interference generated by the breakdown of the sample.

接保护地线，主要是减少试样击穿时对周围产生的较强的电磁干扰。

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The protective earth dike shall be earth-filled. no rock brick and concrete block or light and flammable material shall be allowed for filling.

防护土堤应用土填筑，不允许使用石块、砖块及混凝土块或者轻而可燃的材料填筑。

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Material from the RQ36 asteroid will be sent back to Earth in a special protective device.

VOA: special.2011.06.22

Scientists say the northern lights are created by the sun's super hot atmosphere, which blasts particles into the protective magnetic field surrounding the Earth.

CNN: 'Dancing lights' draw thousands to frozen north

"This number is a reminder that for the last 150 years and especially over the last several decades we have been recklessly polluting the protective sheath of atmosphere that surrounds the Earth and protects the conditions that have fostered the flourishing of our civilization, " Gore said in a statement.

NPR: Greenhouse Gas Milestone; CO2 Levels Set Record