把手一种曲形的金属操纵把手，比如说在自行车上的。

A curved metal steering bar, as on a bicycle. Often used in the plural.

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要开动这台机器，司机得坐上座椅，操纵把手，使发动机驱动自行车。

To set the vehicle in motion, the driver climbs aboard, takes hold of the steering bar and connects the engine to the bicycle.

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三年前，一个研究小组断言犬类也会这么做，他们进行了类似的实验，不过是让一条狗观察另一条狗用它的爪子或者嘴巴去操纵一个把手。

Three years ago a group of researchers asserted that dogs could do the same, using a similar experiment, but with a dog watching another dog using its PAWS or mouth to manipulate a handle.

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