Fortunately, the CTLs can be turned off by activating a molecule called PD1.

幸运的是，可以通过激活一种叫做 PD1 的分子来关闭 CTL。

During the day, sunlight activates the molecules, slowing down growth.

白天，阳光激活分子，减缓生长。

For the first time, we are able to activate molecules that existed billions of years ago to understand and capture what happened back then.

这是我们第一次成功激活了几十亿年前存在的分子，理解、捕捉当时发生的事情。

Acute stress and anxiety activate molecules called corticotropins, which produce hormones that tell the body to do certain things, like release the stress hormone cortisol.

急性压力和焦虑会激活一种叫做促肾上腺皮质激素的分子，促肾上腺皮质激素会产生荷尔蒙，告诉身体做某些事情，比如释放压力荷尔蒙皮质醇。

We then synthesize these ancient DNA molecules and engineer them inside organisms. For the first time, we are able to activate molecules that existed billions of years ago to understand and capture what happened back then.

然后我们合成这些古老的 DNA 分子，并在生物体内对它们进行改造。我们第一次能够激活数十亿年前存在的分子来了解和捕捉当时发生的事情。