即将成为宇航员的六人将于这周开始进行长达520天的模仿火星任务的模拟太空航行。他们将如何应付巨大的心理压力呢？
Six would-be astronauts will this week begin a 520-day mock space voyage to simulate a mission to Mars. How will they cope with the huge psychological pressures?
在这张图的上边，血管壁细胞模仿毛细血管，，在另一边，模拟肺癌细胞的肺上皮细胞。
On one side of the sheet, blood-vessel cells mimic a capillary wall; on the other, lung-cancer cells mimic lung epithelial cells.
最好的学习体验是模仿你在现实生活中学习这东西的情形——但却以一种安全、模拟和集中 的形式展现出来。
The best learning experience considers the way you'd learnthat particular thing in real life -- but offers it in a safe, simulated, compressed form.
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