That international agreement, which is enforced by individual countries, requires ships to leave the transponders on and active. But there is no physical mechanism preventing a crew from switching it off or broadcasting a false position.
In short, shale is rock that contains oil and natural gas. Think of shale as energy yet to be tapped. The more shale the U.S. accesses, the more energy we’ll have—and the more easily oil prices can keep from spiking as much thanks to a greater supply.,更多细节参见有道翻译
,这一点在谷歌中也有详细论述
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openssl command line tool stuff,