The jet sliding along the ridge on isentropic surface is consistent with the dark zone in WV image.

沿等熵面高脊区的下滑急流与水汽图像暗区相当一致。

youdao

The main results are as follows: The dry zone and high potential area above middle-level corresponded well with dark zone in WV image, which showed the dry intrusion was obvious.

结果表明： 北京地区高低层配置符合干侵入三维模型， 中层以上的干区与水汽图像的暗区相吻合， 同时配合有自高纬向低纬传播的高位涡带， 北京地区干侵入特征明显。

youdao

Burned coating: refers to the surface coating seriously dark, rough, such as carbon color generally. (means high current density zone).

镀层烧焦：指镀层表面严重黑暗，粗糙，如碳色一般。(指高电流密度区)。

youdao

And the challenge for the Conservatives is to actually fight Blair on the ground that we have traditionally occupied rather than spinning off to the right into the sort of dark twilight zone, no doubt getting huge cheers from the small audience at the party conference but utterly relevant to the rest of the British people.

BBC: News | BREAKFAST WITH FROST | STEVEN NORRIS CONSERVATIVE VICE CHAIRMAN

Another alternative is to let peripheral Europe leave the zone and rebuild it with Denmark and Sweden as a kind of "dark winter night" economic zone, based on sound principles and weak beer.

BBC: Ten points on the Euro crisis

It's only when you're outside in the dark that you look back and see that the safety zone you always took for granted wasn't a safe zone at all -- just a temporary reprieve from disaster.

CNN: Review: Kidman shines in painfully honest 'Rabbit Hole'