Into some bacteria they inserted genes for resistance to particular antibiotics; the idea is that only the antibiotic-resistant bacteria are carrying the real message.
在一些细菌中他们添加了抵抗特定抗生素的基因。原理如下，只有那些载有抗生素抗体基因的细菌才携带有真实的信息。
In effect, a negative resistance is inserted in the circuit so that its total resistance is zero.
实际上，这就是把负电阻接入电路，使电路的总电阻为零。
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