According to the formula,the hen was pure-strain wild--not a taint of the sluggish domestic bird in her blood--and the ornithologists were camping in the woods,protecting her nest from predators and taking pictures.

• 根据公式计算，那雌火鸡是纯种，没有沾上一丝家养火鸡品种不良的成分。为了拍照和保护那个窝不受捕食动物的侵扰，鸟类学家们在树林里扎营露宿。