What is the material basis of "four nature" is the critical point of TCM study, especially the quantitative criteria.

四性的物质基础一直是中医药基础研究的难点，尤其是定量研究方面。

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All four subspecies of gorillas are listed as endangered or critically endangered by the International Union for Conservation of Nature.

大猩猩的四个亚种都被国际自然保护联盟列为濒危动物或者极度濒危动物。

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Neither Fang, Shao nor any of four authors of other articles that included similar maps responded to requests from Nature for details of these regulations.

然而不管方先生和邵女士，还是其他文章里含有类似地图的四位作者都没有回复《自然》有关这些法规详细情况的询问。

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She says her hope comes from her belief in four things: the human brain,the human spirit, nature's strength and the energy of young people.

VOA: special.2009.11.18

"There are four systems in nature that oscillate, and this is the last one where a single-channel measurement has crossed the five-sigma threshold - we know now about mixing in all four of these systems, " he told BBC News.

BBC: LHC's D-meson study wraps up antimatter 'flip' story

Equally importantly, the Higgs allows two of the four forces in nature -- the electromagnetic force and the weak force, which is responsible for most nuclear reactions -- to be unified and described by mathematics of the same type that describe the other two known forces, the so-called strong force and gravity.

CNN: Higgs and the holy grail of physics

Today, visitors can tour the meticulously restored mansion, tour the four gardens, hike the nature trail or explore personal artifacts such as the first president's shoes or his favorite swivel chair in a vast state-of-the-art museum on the grounds.

CNN: Five places to rendezvous with presidents