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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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。

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After pulling off the shell, she observed the hard-boiled egg.

她把蛋壳剥下后，观察了一下这个煮老了的蛋。

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The laser, which made a rapid-fire popping sound, cut cleanly and quickly through the outer shell of a hard-boiled egg.

WSJ: To Cut Tooth Decay: A Laser vs. a Drill