random mutation/amn

21.   Through random genetic mutations, germs develop immunity to these drugs.

a. + mutation >>共 150 个
genetic 30.05%
random 4.82%
new 4.13%
natural 2.75%
different 2.52%
same 2.06%
particular 1.83%
single 1.38%
specific 1.38%
inherited 1.38%
random + n. >>共 529 个
drug 5.69%
access 4.83%
violence 3.69%
test 3.60%
check 3.23%
sample 3.14%
act 2.92%
search 2.23%
number 1.91%
sampling 1.78%
mutation 0.96%
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