That can't be the only reason; fascination with understanding the physical world and an emotional need to discover new things has to enter into it, too.
那可能不是唯一的原因；也包括对理解物理世界的陶醉和对发现新事物的情感需求。
The pursuit of a youthful physical appearance is not, however, the sole reason for America's fascination with diet and exercise.
然而，追求年轻的身体就不再是美国对节食和锻炼入迷的唯一原因。
That can't be the only reason – fascination with understanding the physical world and an emotional need to discover new things has to enter into it too.
当然这不是唯一的原因——理解物理世界的热情和发现新事物的感情也是很重要的。
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