The drawback is the need for collision handling which will be very expensive if collision are frequent.

缺点是如果冲突时常发生时，解决冲突所需的花费是昂贵的。

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The hub or repeater simply repeats an incoming signal on all ports and also sends the jam signal to all ports if there’s a collision.

简单来说，中继器将正常情况下收到的信号，和数据碰撞时产生的拥塞信号重复发送到所有的端口。

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If the vehicle in the unfortunate circumstances of a collision, has to be able to maintain the security of the hydrogen which means more mass, which means a lot of the efficiency is being squandered What's the environmental impact of hydrogen production?

如果车辆,在碰撞中发生了不幸，要仍然能够保持氢气的安全性的话,意味着需要更多的质量，也就是说大部分效率被浪费了,制氢对环境有什么影响呢？

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Over the next couple of years, such sensors will expand their range, to check for obstacles entering a car's blind spots and issue warnings to drivers if a collision seems imminent.

ECONOMIST: MONITOR

In the case of the Russian satellite in January, "it would have been very difficult to tell there had been a collision if it hadn't been for the fact that somebody was operating the satellite and noticed a collision, " said Kelso.

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Small clouds of starlings charge onto the scene from offstage as if bent on collision, then integrate perfectly and instantly with the larger formation.

ENGADGET: Editorial: Tech is a flock of starlings