The subject of rock 'n' roll has been controversial and a source of conflict between parents and children ever since it first appeared on the scene in the mid 1950's.

自从二十世纪五十年代中期诞生以来，摇滚乐就一直是父母和孩子之间冲突的原因之一。

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The study of geochemistry indicates that these metabasic volcanic rocks are characterized with N-type MORB (mid-ocean ridge basalt).

地球化学研究表明，其为典型的大洋拉斑玄武岩（MORB型玄武岩）。

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The suddenly changeover multicriterion assessment method is used to evaluate several scenarios of water source engineering in Mid-line of S-N water diversion project.

应用突变多准则评价法对南水北调中线水源工程项目的多方案比选作出评价决策。

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"North Korea changed their behavior and words from mid-July, that's the point U.N.Security Council resolution 1874,to be implemented,".

VOA: standard.2009.12.08

Some recent studies have revealed a significant concentration of particles in near-surface waters in areas of mid-ocean accumulation (N Pacific and NW Atlantic gyres).

UNESCO: All Events | United Nations Educational, Scientific and Cultural Organization

The U.N. has an office of internal oversight, set up at U.S. behest as part of a push for U.N. reform in the mid-1990s.

FORBES: Keep An Eye On The U.N.

And Prime Minister Hun Sen, who has been in power since the mid-1980s, has portrayed the U.N. recognition as a national triumph.

CNN: Cambodia reports Thai incursions to U.N.