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the endless __u_and d___ of living无尽的人生起伏

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social relationships also _d__（巨大而突然的，急剧的）influence our _m______ rate社会关系也极大地影响着我们的死亡率。

we _ea spontaneous social _i____ to make friends from a very early age.我们在很小的时候就表现出一种自发的社交本能，喜欢交朋友。

Through shared activities, strong ｂ（复数）are often created.通过共同的活动，往往可以建立牢固的纽带。

There's no _p in joining a bridge club if you hate playing cards.如果你讨厌打牌，参加桥牌俱乐部是没有意义的。