有效的跌伤预防规划旨在减少跌伤者数量，降低跌伤率，以及减轻伤害的严重程度（如果发生跌伤的话）。
Effective fall prevention programmes aim to reduce the number of people who fall, the rate of falls and the severity of injury should a fall occur.
通过吃掉老弱病残和受伤者，鲨鱼协助维持其猎物鱼群的基因健康，同时也使其数量保持平衡。
Sharks help maintain the genetic health of the fish populations they feed on by eating the weak, sick and injured. They also keep their prey populations in balance.
通过吃掉老弱病残和受伤者，鲨鱼协助维持其猎物鱼群的基因健康，同时也使其数量保持平衡。
Sharks help maintain the genetic health of the fish populations they feed on by eating the weak, sick and injured.They also keep their prey populations in balance.
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