1.Recently, 200 scientists from 45 countries took turns researching plankton on a two-mast schooner.
take turns 依次,輪流(說、做等),輪班
He and Carla Torgerson take turns as the band's lead vocalist.
他和卡拉·托格森輪流擔(dān)當(dāng)樂隊(duì)的主唱 。
Males and females take turns brooding the eggs.
雄鳥和雌鳥輪流孵蛋 。
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(或來由);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.
這個(gè)謠言追究到湯姆身上 。