They picked over the cotton seeds before sowing.
他们将那些棉籽经过挑选之后才播种。
Residues of thidiazuron and its isomers were determined in cotton seeds and soil.
噻苯隆及其异构体在棉籽和土壤中残留量测定方法。
The final residues of the insecticide remained in cotton seeds were discovered to be not detectable.
最终残留量的测定结果说明,氟氯菊酯在棉籽中无残留。