单词	paper factor
释义	paper factor noun : a substance originally isolated from pulpwood of the balsam fir that is a selectively effective insecticide with activity like that of juvenile hormone called also juvabione Word History First Known Use 1966, in the meaning defined above
随便看	ploughboy ploughboys ploughed plougher ploughers ploughgang ploughgate ploughhead ploughing ploughings ploughland ploughlands ploughline ploughman ploughman's lunch ploughmen ploughpoint ploughs ploughshare ploughshares ploughshoe ploughstaff ploughwright ploughwrights plouk

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