Still, efforts to roll back homework have been opposed by those who counter that there is not enough time in the school day to cover required topics and that homework reinforces classroom learning.

与此同时，减负的努力遭到了很多反对，反对者认为课内的时间根本不能照顾到所有的学习内容，而家庭作业可以巩固课间的学习效果。

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These schools, where a friendly atmosphere reigns, provide courses lasting from a weekend to three or four weeks, and cover a wide range, from medieval and classical music to rock-and-roll and pop.

这些学校氛围友好，有的课程只有一个周末，也有课程持续三、四周，音乐种类众多，中世纪音乐、古典音乐、摇滚乐和流行音乐。

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Cover with a damp cloth until you are ready to roll the tortillas.

然后用一块湿布盖住，好让你准备好将饼成型烘烤。

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The unnamed song from the Rock and Roll Hall of Famer will cover more than just the events in Boston.

CNN: SHARE THIS

The highly ambitious LTE roll-out now is projected to cover 120 Million subs by end of 2012.

FORBES: Sprint Brings More Drama - Verizon Giggles

Greece's euro-zone partners could find themselves with a large and open-ended commitment to roll over the country's existing debts and to provide cash to cover its budget deficits.

ECONOMIST: Bailing out Greece