If it is left too long, it begins to give off a bad smell.

假如把它放得太久了，它就会开始发臭。

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Frostbite - dogs that are left too long in cold conditions can get frostbite, usually on their ears, tails and feet.

冻伤——狗狗在寒冷条件下待太久会冻伤，像耳朵，尾巴和脚这些部位会经常冻伤。

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His skin had lost its luster and had a dull, leathery look, like a chicken wing left in the freezer too long.

他的皮肤已经失去了光泽，看上去有点暗淡的皮革色，像一只放在冰箱里太久的鸡翅。

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Melanoma, because of its tendency to spread if left too long, may require extra treatment such as chemotherapy.

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He said the focus of hospitals was now slipping and patients were being left waiting for too long.

BBC: Long hospital waits 'on the increase'

The milk jug is also outfitted with a temperature sensor that can alert users when milk has been left out for too long.

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