Similar in concept to vestigial structures are atavisms, which are the reappearance of a structure or trait that isn't found in the immediate ancestors.

跟退化结构相似的概念还有返祖现象，它的意思是生物体身上重新出现直系祖先没有的结构或特征。

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The immediate roadblock was the creation of a charging structure by the makers, Six Apart, to support the development of its product.

主要的障碍是其创建者Six Apart创建了一个收费结构来支持它的产品开发。

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The interplay between the belief structure and the external environment shaped the immediate policies and choices and provided a rationale to support them.

信仰结构和外部环境的相互作用形成的直接政策和选择，并提供了一个基本原理去支持他们。

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The teachers have now downgraded their demands, calling for immediate implementation of the original pay structure pledged around 18 months ago, which accords pay to qualifications and positions held.

BBC: Maldives teachers strike over pay

Now Mr Byers's immediate tasks are to devise a new railways structure that serves passengers better and to ensure that the railways can still raise the private finance that his plans envisaged.

ECONOMIST: Railtrack

This could leave the services vulnerable if one of the other major contingencies resolves itself before we have a transformation strategy in place, creating a strong demand for immediate, deep, and unwise cuts in force structure and personnel.

CENTERFORSECURITYPOLICY: Center for Security Policy | The Measure of a Superpower: A Two Major Regional Contingency Military for the 21st Century | Page: 2