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BillCurran

BillCurran

BillCurran

BillCurran

1

Bill Curran is a professor of weed science at Penn State .

比尔·柯伦（BillCurran ）是宾夕法尼亚州立大学的杂草科学教授。

2

And, as weed expert Bill Curran at Penn State University points out , they avoid the use of chemicals . Or the labor of pulling weeds by hand .

就像宾夕法尼亚大学杂草专家 BillCurran 指出的，他们避免使用化学制剂，也不需要用手拔除杂草。

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