At present, the negotiation about China's entry into WTO has been in essential phase.

目前中国加入WTO谈判已进入实质阶段。

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Other people say that REM sleep is the only essential phase of sleep, so core sleep isn't necessary.

所以相对来讲，是否保证核心睡眠是没有必要的。

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It is an essential phase for Chinese people to learn and use English, and it has its own internality and law.

它是中国人在学习英语、使用英语时的必经阶段，有自身的内在性和规律。

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"The work is essential to allow the next phase of the reopening process to progress, " said Portishead Railway Group vice-chairman Colin Howells.

BBC: Portishead railway line cleared ahead of track checks

An essential guide to how to avoid repeating a particularly nasty phase of our economic history.

ECONOMIST: Acknowledgments

This knowledge is essential, and your company will benefit from it at every phase of growth.

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