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。

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Thirdly, a automatic identification system of weed wae built based on former two steps, which might identify weeds in image and carries out simulative spay to site-specific weed locations.

第三部分则是在前两步的基础上建立了一个杂草自动识别系统，该系统能识别出图像中的杂草，并根据杂草的位置定点模拟喷洒。

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