The function of forest floor on water conservation, nutrient supply, promoting biological respiratory intensity and soil development are discussed.

探讨了森林地层在水土保持、养分供应、促进生物呼吸强度和土壤发育等方面的作用。

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A completely different theory holds that yawning assists in the physical development of the lungs early in life, but has no remaining biological function in adults.

另一种完全不同的理论认为，打呵欠有助于生命早期肺部的生理发育，但对成年人没有任何剩余的生理功能。

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It is then clear that biological development and cultural development are closely tied.

显然，生物发展和文化发展是紧密联系的。

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It also describes Mr Hussein's elaborate attempts to conceal his weapons programmes, including the development of mobile biological-weapons laboratories.

ECONOMIST: Getting tough | The

Meanwhile, Colorado voters were projected to reject an anti-abortion amendment that would have defined a "person" as "every human being from the beginning of the biological development of that human being, " according to a CNN analysis of exit poll data.

CNN: Variety of proposals on ballots in 37 states

In 1972, the U.S. and virtually every other civilized nation signed the Biological Weapons Convention, which prohibits the development, stockpiling and use of biological arms.

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