In this paper, the problems about shock-absorbing designs of the second species of the main-secondary structures are studied on the basis of the structural composite control theory.

本文利用结构组合控制理论对第二类主、附结构的减震设计同题进行了初步的研究。

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They will tum out to be the second-largest species of birds to become extinct.

它们将成为第二大灭绝的鸟类。

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I began a second drawer for more general discoveries: new cave system discovered with dozens of nameless species, four hundred species of bacteria found in the human stomach.

我打开了第二个抽屉里，寻找更普遍的发现：在新的洞穴系统里发现了几十种不知名的物种，在人的胃里发现了400种细菌。

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In the second part of our series on endangered species, CNN examines the force behind the movement to weaken the Endangered Species Act.

CNN: Is Endangered Species Act in danger? - Sept. 26, 1995

The Juniper forest ecosystem of Ziarat-Pakistan is reputed to be the oldest and world's second largest, and harbors some of the unique species of Juniperusexcelsapolycarpu.

UNESCO: NATURAL SCIENCES

The second is that accurate global DNA maps exist only for about 20 species of tree, and the tests are no use unless you know what you are looking for.

ECONOMIST: Genetic testing of wood can curb illegal logging