If the dog approaches you, stop and stand very still. Don't yell or make any sudden movements.

如果看到有狗要接近你的话，你就停下来，一动不动的站着，千万不要大喊或者做一些突然的动作。

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And stop right away if you feel any sharp or sudden pain.

如果你突然感到有针刺样的疼痛请立即停止。

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But rapid or even sudden population decline would be disastrous, and it would be very difficult to stop.

但是快速的、甚至突然的人口降低会是灾难性的，而且这种降低很难停止。

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The sudden downward move caused stop orders for many stocks to be executed, leaving some shareholders with unanticipated losses or realized capital gains.

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