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.

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。

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The machine looked like a giant pair of scissors, with blades thicker than my father's body.

这台机器看上去像一把硕大无比的剪刀，其刀片比我爸的身躯还要厚。

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One of his tasks is to use a computer-controlled machine tool to burn tiny cooling holes electrically in 3-inch-long turbine blades for aircraft jet engines.

他的工作职责之一就是用机控机床为喷气式飞机引擎的3英尺长的涡轮机叶凿出小孔。

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Besides the inevitable headaches that would come from trying to obtain permits to install a 25-story machine with blades that stretch 250 feet, such a turbine would generate more electricity than a typical store needs, Pool says.

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This involves pitching the machine's nose up to reduce its forward velocity and increase the speed of rotation of the blades (and thus the amount of lift they provide) to soften the landing.

ECONOMIST: Monitor