When the wire is longer than 600 meters, you must shield them or set metal pipeline.

导线长在600米以上时，应采用屏蔽或金属管道布设。

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The gravitational shield of the giant outer planets, while highly efficient, must occasionally fail to protect Earth.

巨大的外行星的引力护盾虽然效率很高，但偶尔也会无法保护地球。

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Third, the gravitational shield of the giant outer planets, while highly efficient, must occasionally fail to protect Earth.

第三，巨大的外行星的引力屏障虽然非常有效，但偶尔也会无法保护地球。

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This rivets marketers, but riles privacy advocates, who argue Yahoo and other Web sites must do more to shield their customers from unauthorized and overly intrusive tracking techniques.

FORBES: The Killer Ad Machine

Judge Ito did not immediately decide if her information is so crucial to Simpson's defense that she must divulge it despite the shield.

CNN: O.J. Simpson trial: Debate over 'Fuhrman Tapes' heats up

To protect electronics infrastructure, entire systems must be encased in a metallic shield to prevent any external electromagnetic pulse from entering.

CENTERFORSECURITYPOLICY: Old threat with a new face