Concerns about a double-dip recession were back in the news this week.

VOA: special.2010.07.02

I just come back with my black coffee and my double espresso mocha latte skinny frothed, except it isn't espresso.

我回到桌位上，双手拿着我的黑咖啡,和一杯双倍浓度无咖啡因少泡沫的穆哈咖啡，其实不是无咖啡因的。

耶鲁公开课 - 心理学导论课程节选

It's a double stranded circular piece of DNA, meaning that the 3', 5'ends that hang off are joined back together again to form a continuous loop.

它是双链环状DNA,它的3'末端和5'末端首尾相连,构成一种连续环状结构

耶鲁公开课 - 生物医学工程探索课程节选