突變株

mutant / mutant strain (of virus)

to dash / to move forward quickly / to bulge / to protrude / to break through / to rush out / sudden / Taiwan pr. [tu2]

sudden change / mutation

to change / to become different / to transform / to vary / rebellion

tree trunk / stump (tree root) / a plant / classifier for trees or plants / strain (biology) / to involve others (in shady business)