17、These areas have particularly low concentrations of iron, and oceanographershypothesizethat this shortage of iron prevents plankton from thriving.(这些地区的铁含量特别低,海洋学家推测,铁的缺乏阻碍了浮游生物的繁殖。) 18、And some people take this a step further, and theyhypothesizethat this migrat...
Some biologists hypothesize that a plant will stop growing if it's in the shade of another plant, a reaction that's triggered when it senses an unusual ratio of red light to far-red light.(一些生物学家假设,如果一株植物处在另一株植物的荫蔽下,它就会停止生长,当它感知到红光与远红光的不寻常...