Ana Wisneski of the U.S. Coast Guard. Bring plenty of water to drink, sun protection, a flashlight, vital medications, and white sheets or colorful towels to signal rescuers.

带上足够喝的水、防晒用品、手电、救命药、白色床单或者颜色鲜艳的毛巾作为求救信号。

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With two diodes in parallel back to back, the circuit will provide protection regardless of the signal polarity.

由于两个二极管反向并联，所以此电路能够对任何极性的信号进行保护。

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The series mixed SPD is a new method of using for the railroad signal system of over voltage protection.

串混型SPD是铁路信号系统过电压防护的新用法。

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America is planning to improve its satellite-navigation system further: next year, it will start launching a second generation of GPS satellites, which will offer greater accuracy for civilian users and, for military purposes, greater protection against the signal being jammed by an enemy.

ECONOMIST: Space race | The