Therefore the first bird that evolved into what we would call a chicken, probably in prehistoric times, must have first existed as an embryo inside an egg.
因此很可能在史前时代，第一只进化成为我们称之为鸡的鸟，应当首先是以蛋壳内的鸡胚形式存在。
Even if investigators have indeed found the salmonella source, you may wonder, how can the bacteria get inside the hard shell of an egg?
即使调查人员已经找到沙门氏菌源头，你可能会好奇，这种病菌是怎样破壳而入得。
Even if investigators have indeed found the salmonella source, you may wonder, how can the bacteria get inside the hard shell of an egg? Let us count the ways.
即使调查人员已经找到沙门氏菌源头，你可能会好奇，这种病菌是怎样破壳而入得。让我们看看吧。
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