...tle trap）为题，全面论述了对隐蔽圈闭（subtle trap）的新认识，表示“subtle trap”与早期所用的复合圈闭（combination trap）有所区别。
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... 组合法勘探 compositive exploration 组合圈闭 combination trap 钻杆定心器 drilling rod centralizer ...
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combination trap gas reservoir 复合圈闭气藏
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That may be because the combination of low wages, expensive housing and state benefits create a poverty trap that discourages people from working.
ECONOMIST: Immigrants
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