当然，一棵苹果树能存活多久是由许多因素决定的。

Of course, a number of factors will dictate how long an apple tree can survive.

《柯林斯英汉双解大词典》

忽视心脏病严重程度这个因素，猫、狗饲养者心脏病发后存活下来的几率比其他人要高。

Dog and cat owners are significantly more likely to survive heart attacks than non-pet owners, regardless of the severity of the heart attacks.

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Naomi Neufeld医生UCLA的内分泌专家说：“糖原是思考的必需品，是肌肉活动的必需品，糖原是普通细胞存活的必要因素。”

"Glycogen is necessary for thinking; it's necessary for muscle action; it's necessary just for the cells to live in general," says Dr. Naomi Neufeld, an endocrinologist at UCLA.

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