一家公司计划开发一种原型除草机，它使用带有光学传感器和微处理器的刀片，通过颜色的深浅区别杂草和作物。
A company plans to develop a prototype weeding machine that uses cutting blades with optical sensors and microprocessors that distinguish weeds from crop plants by differences in shade of color.
反复的施除草剂后，杂草终于被消灭了。
With repeated applications of weedkiller, the weeds were overcome.
对农民来说至关重要的是，他们用来控制杂草的除草剂不能损害他们的庄稼。
It is crucially important to farmers that the herbicides they use to control weeds not damage their crops.
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