return [y is not None and xs[y] for y in presum(ys)]
Определился победитель первого Гран-при нового сезона «Формулы-1»Пилот «Мерседеса» Рассел стал первым на Гран-при Австралии。业内人士推荐新收录的资料作为进阶阅读
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Overturning long held assumptions, some plankton rotate their bodies into a current to rise more quickly to the surface, a strategy researchers have dubbed surfing [Journal of Experimental Biology]
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