The hull may be built with glass-reinforced plastic (GRP) to reduce its magnetic signature.

船体可能采用玻璃钢(grp)建造减少它的磁性特征。

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"We had to find a rock that had just enough iron to record a magnetic signature, but not so much that it would be affected by later chemical changes," Tarduno says.

“我们必须找到一块岩石，它含铁量恰恰好能够用来记录磁信号，却又不至于多到后来受到化学变化的影响”，塔都诺说。

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The CVV is often printed on top of the fragile signature strip, and is never encoded into the data stored on the magnetic stripe.

CVV通常印在脆弱的签名地带，和永远不会被编码进存储在磁条上的数据。

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And the magnetometer has found a distinctive magnetic signature which, some claim, suggests that Mars, too, may once have had tectonic plates.

ECONOMIST: Martian chronicles