There was a double knock at the door.
门上接连敲了两声。
Please knock double knocks AT the door before entering.
请先敲两下门再进来。
But as the big woods of the Mississippi Delta were chopped down, the woodpecker-with its distinctive tooting call and double knock-was slowly exterminated.
但随着密西西比三角洲的森林被砍伐殆尽，这种能制造出独特的“嘟嘟，嘟嘟”啄木声的啄木鸟已经渐渐灭绝了。
This aversity to double-stranded RNA means short hairpins can be used to knock out the messengers, thus nullifying the signal from the underlying gene.
哺乳动物细胞对双链RNA不识别意味着可用短发卡RNA来阻断信使RNA,从而使相应基因的信号无法传递。
This aversity to double-stranded RNA means short hairpins can be used to knock out the messengers, thus nullifying the signal from the underlying gene.
哺乳动物细胞对双链RNA不识别意味着可用短发卡RNA来阻断信使RNA,从而使相应基因的信号无法传递。
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