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.
就像宾夕法尼亚州立大学的杂草专家指出的，weed whackers割草机避免了化学品的使用，也避免了手工清除杂草的劳动。
Bill Curran is a professor of weed science at Penn State.
BillCurran是宾夕法尼亚州立大学的杂草科学教授。
Bill Curran is a professor of weed science at Penn State.
BillCurran是宾夕法尼亚州立大学的杂草科学教授。
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