Genetic engineering sometimes entails plant or animal genes' getting spliced into other species' DNA, either to improve crop yields or for warding off insects or disease.
plant or animal genes' getting spliced into other species' DNA, either to improve crop yields or for warding off
plant or animal genes that get spliced into the DNA of other species, either for improving crop yields or the warding off of
the splicing of plant or animal genes into other species' DNA, to either improve crop yields or to ward off
splicing plant or animal genes into the DNA of other species, either to improve crop yields or to ward off
splicing of plant or animal genes into the DNA of other species, for either the improvement of crop yields or to ward off
A,to do和for doing不能平行
if you have a two-part parallel signal, such as either ... or, then the words FOLLOWING EACH PART must have the same structure.
if you have a one-part parallel signal, such as or/and, then the words locked by the parallel signal must have the same structure.
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