Earth is experiencing its "sixth great extinction event" with disease and human activity taking a devastating toll on vulnerable species, according to a major review by conservationists.

根据自然资源保护者的重要回顾报告，地球正经历“第六次大灭绝事件”，因为疾病和人类活动正在令脆弱的物种遭受到灾难性打击。

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Sixth, we should step up cooperation on major international and regional issues.

第六，加强两国在重大国际和地区问题上的合作。

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Mathematical methods for designing high homogeneous NMR Superconducting-magnets, giving the major parameters of sixth order compensated solenoids with minimum winding volume.

本文给出了高均匀度的NMR超导磁体的设计方法。给出了体积极小的六阶补偿线圈的各个参数。

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Stewart, batting ninth, led off the third with a drive to left for his sixth major league home run.

WSJ: Colon outpitched by Hughes; A's lose to Yanks 4-2

As the Tribune reports today, Chicago would become the sixth major city to deploy these cameras in designated areas.

FORBES: Rahm Puts On the Red Light

As the sixth major powers consider the issue of Iran's nuclear program, the Russians have backed away from any talk of sanctions.

NPR: Russia Pushes Diplomacy Option with Iran