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1.Recently, 200 scientists from 45 countries took turns researching plankton on a two-mast schooner.
take turns 依次，轮流(说、做等)，轮班
He and Carla Torgerson take turns as the band's lead vocalist.
他和卡拉·托格森轮流担当乐队的主唱。
Males and females take turns brooding the eggs.
雄鸟和雌鸟轮流孵蛋。
2.That basically means every fifth time that you breathe, you're breathing oxygen -- which we can directly trace back to diatoms,
trace back to 可追溯到；追溯到…的起源(或来由)；找出根源；追查到，追究到：
His family can trace its history back to the Qing Dynasty.
他的家族史可追溯到清朝。
The rumour was traced back to Tom.
这个谣言追究到汤姆身上。
