该句使用主系表结构表达生命状态，语义简洁直接。
In mathematics, there is a shape known as the "bell curve." It rises from a low point toward a peak and then gradually descends, returning to its original level, resembling a bell, a hat, or a small hill.
I recently came across a humorous take on the definition of success in life that perfectly fits this bell curve:
At age four, success is not wetting your pants. At age twelve, success is having a group of friends. At age seventeen, success is having a driver's license. At age thirty-five, success is having wealth (this represents the ascending half of the curve).
At age fifty, success is having wealth. At age seventy, success is still having a driver's license. At age seventy-five, success is still having a group of friends. At age eighty, success is not wetting your pants (this represents the descending half of the curve).
It is evident that the first half of life is about striving to "acquire," while the second half is about striving to "avoid loss."
Regrettably, it is often easier to seek "acquisition" than to prevent "loss," for while the first half of life is shaped by human effort, the second half is often dictated by fate. Aging is an inevitable journey of life.
This bell curve might serve as a sobering reminder for ambitious young people. It suggests that after all the striving and struggles, old age eventually arrives, and success, in its simplest form, might just be the blessing of not wetting one's pants, much like a four-year-old child.
在数学中，有一种被称为“钟形曲线”的图形，它先由低向高攀升，随后逐渐下降，最终回到初始的高度，形状宛如一座钟、一顶帽子或一个小山丘。
最近，我读到一段关于“人生成功定义”的幽默描述，恰好符合这条钟形曲线：
四岁时的成功是没尿湿裤子；十二岁时的成功是拥有一群朋友；十七岁时的成功是拿到驾驶执照；三十五岁时的成功是拥有财富（这是曲线的上升阶段）。
五十岁时的成功是拥有财富；七十岁时的成功是依然持有驾驶执照；七十五岁时的成功是依然拥有一群朋友；八十岁时的成功是没尿湿裤子（这是曲线的下降阶段）。
由此可见，人生的上半场在于努力“获得”，而人生的下半场则在于竭力“避免失去”。
可惜的是，追求“获得”往往比守护“不失”更容易，因为上半场尚可谋事在人，而下半场往往成事在天。衰老是每个人必经的生命旅程。
通过这条钟形曲线，对于心怀大志、渴望成就事业的年轻人来说，这或许是一剂清醒剂。它提醒我们：在经历过无数次的拼搏与厮杀后，人到晚年，所谓的成功，或许就像四岁的孩童一样，能不尿湿裤子便已是莫大的庆幸。