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It's a scenario many of us daydream about during a heat wave while stuck in a badly ventilated office or on a stuffy commute. Being able to cool down by plunging into a cold lake or have a dip in the sea sounds pretty blissful when temperatures peak at 31.9C. 大热天被困在通风不好的办公室或闷热的交通工具中时，我们都会幻想这样的场景：当气温高达31.9度时，能够跳到冰凉的河水中或在海中畅游降暑。 But while this may sound fun and refreshing, it can actually be incredibly dangerous - deadly even. This is because at the root of large number of drownings is cold water shock. A condition which is rarely discussed, cold water shock can trigger a deadly heart attack. You may not think anything of having a refreshing swim in the cold water, but with the average temperature of the sea off UK shores between 10 to 15C, the RNLI warn this is in fact cold enough to cause cold water shock. 虽然这听起来令人身心舒畅，但实际上却非常危险--甚至会致命。这是因为大量溺水事件的根本原因在于冷水冲击。很少有人谈论这一情况，但冷水冲击可能会引发致命的心脏病发作。也许，你并没有打算在冰冷的河中游泳，但英国海岸海水的平均温度为10至15度，英国皇家全国救生艇协会警告称，这种温度足以导致冷水冲击。 | 
