Students should be able to make a selection from a range of reference materials and focus their attention on one of them.

学生要能从多种参考资料中作出选择，把注意力集中在其中一种上。

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Make sure the configuration identifier of a resource reference matches the configuration identifier of the resource.

确保资源引用的配置标识符与资源的配置标识符匹配。

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You must remember that to make use of these classes you cannot maintain a strong reference to the object.

您必须记住，要使用这些类，您就不能保留对对象的强引用。

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You know, sometimes images in pop culture are obviously insensitive or offensive, such as Lil Wayne usurping the murder of Emmett Till to make a vulgar reference about sex.

CNN: What's racist about a talking goat?

Labour leader Ed Miliband mocked the chancellor's failure to make any reference to Britain's loss of its Triple A rating with credit agencies during his hour long budget speech.

BBC: Budget 2013: George Osborne halves growth forecast but insists plan is working - BBC News

Aetna and the Financial Planning Association have teamed up on this site to offer some excellent tools to reference while you make your open enrollment choices, including a glossary of benefits terms (aka, dummy guide) and calculators for health and baby-related expenses.

FORBES: 6 Ways to Make the Most of Your Open Enrollment