Smart Kids is an innovative six-level series for preschool, based on the most current theories of brain-based learning.

《聪明宝贝》共六册，以多元智能理论为基础编写而成，是一套设计新颖的学前系列用书。

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For on April 29th the World Health Organisation (WHO) promoted the new disease to level five of its six-level pandemic alert.

4月29日世界卫生组织将这一新型疾病列为其六级警戒系统的第五级。

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The WHO has so far left its six-level pandemic alert scale unchanged at phase five, signalling that a pandemic is "imminent."

迄今为止，世卫组织已已让六级流行警告级别保持在5级不变，表明一场流感大流行迫在眉睫。

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All are highly-educated management-level professionals who previously earned six-figure salaries.

VOA: standard.2010.07.28

The World Health Organization says it needs to see clear evidence of sustained community transmission of the swine flu virus from person-to-person in at least two regions of the world before it raises its alert to the phase six pandemic level.

VOA: standard.2009.05.14

The World Health Organization on Monday raised its alert level from three to four on its six-level scale.

CNN: World battles swine flu as death toll rises

On a vacant lot at 34 East 62nd Street, developer Janna Bullock is planning to build a six-level Modernist limestone townhouse designed by architect Preston Phillips.

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The move from level three to level four on the WHO's six-level threat scale means the world body has determined the virus is capable of significant human-to-human transmission -- a major step toward a flu pandemic, said Dr. Keiji Fukuda, the agency's assistant director-general.

CNN: The story