As technology and society permit highly effective and generally acceptable methods of family planning there has been a decline in family size.

由于技术和社会允许采用高度有效和普遍可接受的计划生育方法，因此家庭规模有所减少。

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Because we chose a two disk parity setup, the effective storage size will be close to the total of the other three devices.

因为选择安装两个磁盘奇偶校验磁盘，所以有效存储大小将接近于其他三个磁盘的总和。

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As development teams grow in size, there's a greater need for effective ways to communicate.

当开发团队的规模不断增长时，对于有效的交流方法的需求就越来越大。

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It needed a shorter duration, and a larger size to be effective.

FORBES: FOCUS: Fed's 'Twist' Program Likely To Have Little Long Term Impact On Markets

It is incredibly clear that the current policy of TB control is an abject failure, so carrying on as we are is doomed to increase the size of any effective future badger cull.

BBC: Viewpoints: The badger cull

The effective mirror size for a virtual telescope made up of spacecraft flying in formation depends on the separation of those spacecraft.

ECONOMIST: Birds of a feather