Over three years, this ongoing sacrifice translates into a first-class degree and a scholarship to graduate school; over a lifetime, it can mean groundbreaking contributions and so on.
三年之后，这种持续的牺牲就会换来一等学位和读研的奖学金；在一生中，它可能意味着开创性的贡献等等。
Mean Lifetime
原声例句
Fastrack雅思阅读高分秘籍
中文百科
指数衰减 Exponential decay
（重定向自Mean Lifetime）
某个量的下降速度和它的值成比例，称之为服从指数衰减。用符号可以表达为以下微分方程，其中N是指量，λ指衰减常数。
方程的一个解为：
这里N(t)是与时间t有关的量，N0 = N(0)是初始量，即在时间为零时候的量。
英语百科
Exponential decay 指数衰减
（重定向自Mean Lifetime）
A quantity is subject to exponential decay if it decreases at a rate proportional to its current value. Symbolically, this process can be expressed by the following differential equation, where N is the quantity and λ (lambda) is a positive rate called the exponential decay constant:
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