But the mouse and monkey findings appear to mark the most substantial scientific progress yet in the search for ways to extend human life spans — once viewed as a fringe area of study.

不过，对于老鼠和猴子的研究发现似乎是延长人类寿命领域这个一度被视为边缘科学研究的一项具有标志性意义的进展。

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Further work is currently in progress to extend the test modeling approach introduced here.

进一步的工作现在正在进展中，它可以扩展测试建模方法的引入。

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Now, suppose you write a new class and extend the in-progress class. Easy enough, right?

现在，假设您要编写一个新类，扩展那个还在开发之中的类，也不难，是不是？

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