"It might take the monarchs as many as four to five generations to complete the journey all the way back up to Canada," says Sarina Jepsen, who directs the endangered species program for the Xerces Society.

“完成返回加拿大的整段旅程，帝王蝶可能会经历四到五代。”薛西斯戈灰蝶协会濒危物种项目的负责人萨琳娜·杰普森说道。

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When a user stares at one of the checkerboard patterns, electrodes on the back of his head pick up the resulting brain signals and are sent to a computer software program.

当用户凝视棋盘的格子时，在他的后脑勺电极收到大脑产生的信号，并传送到计算机软件程序。

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When all map tasks and reduce tasks have been completed, the master wakes up the user program. At this point, the MapReduce call in the user program returns back to the user code.

当所有map和reduce操作完成后，master唤醒用户程序。

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The stock would be under more pressure, except winding down a costly store-makeover program a while back has let Safeway ramp up its share-buyback program.

FORBES: Safeway Shares Should Get More Respect

What happens when these social-media savants go back to the ballet (which I hope they do) and wind up at a program of "only" Balanchine and Robbins?

WSJ: Culture City: The Art of Fishing for Attention