Such competitive displays depend on the speed, strength and size of an animal, which is why they convey a measure of reproductive fitness.

这样的竞争秀依赖于速度、力量以及动物的体型，它们是衡量生育能力的标志。

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That means ensuring the sounds convey information, such as direction and speed, and whether the vehicle is accelerating or slowing.

这意味着要确保声音传递诸如方向与速度，以及汽车是否在加速或减速等信息。

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High speed elevators, escalators, and moving sidewalks would convey people swiftly between one level and another.

高速电梯、自动楼梯和滚动的人行道可将人们迅速地从一个层面输送到另一个层面。

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