科学美国人60秒 SSS 红细胞可“记住”并适应高海拔
时间：2019-02-14 作者：英语课 分类：2017年Scientific American(二)月
Head to the mountains, and if the steep trails don't slow you down, the thin air will. There's less oxygen up there—so strenuous 1 activity can leave you dizzy, out of breath…or worse. But even though you're beat, biochemical processes are already busy at work, acclimating 2 your body.
爬山，陡峭的小路不会减慢你的速度，但是稀薄的空气却可以。山顶部分空气稀薄——所以，剧烈的活动会让你头晕目眩，呼吸困难……或者情况会更糟糕。但是，即使你自己力不从心，但是体内的化学工作仍在紧张进行，使你的身体适应新的环境。
Scientists investigated those pathways in humans and mice. They found that exposure to low oxygen depletes 3 stores of a red-blood-cell protein called eENT1. That's a good thing. Because now other substances that protect your body against low oxygen are free to rapidly accumulate and help the body adapt.
科学家用那些方式调查了人类和老鼠。他们发现，低氧的环境会大量消耗一种叫做eENT1红细胞蛋白质。这是一件非常有益的事情。因为，现在，保护机体对抗低氧环境的其他物质就会迅速积累，来帮助机体适应环境。
But here's the kicker—once the eENT1 protein goes away, it doesn’t come back. Meaning red blood cells kind of 'remember' their altitude exposure. And that means if you hit the mountains again soon enough, you can acclimate 4 faster than you did the first time. The findings are in the journal Nature Communications.
但是，需要注意的是——一旦eENT1蛋白质消失，就不会回来。这意外着红细胞“记住”它们的高度感觉。如果下次再一次很快地到达了山顶，那么这次你的适应速度比上次要加快。该研究结果发表在《自然通讯》杂志上。
There is one caveat 5. "In humans the red blood cell lifespan is 120 days." Study author Yang Xia, a biochemist with the UT Health Science Center in Houston. "So the longer you stay at sea level before you re-climb to high altitude, then such memory will gradually disappear." So unless you're a frequent mountain climber—there's really no shortcut 6 to acclimatization. Then again, there's no shortcut to the summit, either.
但是有一个警示须知。“人类红细胞的寿命是120天。”该研究的作者夏阳是休斯顿健康科学中心的生物化学家。“再次爬上之前，你在海平面地上呆的时间越长，那么这种记忆也就会慢慢消失。”除非你经常爬山——否则没有适应高度环境的捷径。同样，也没有通顶峰的捷径。
- He made strenuous efforts to improve his reading. 他奋发努力提高阅读能力。
- You may run yourself down in this strenuous week.你可能会在这紧张的一周透支掉自己。
- Stress depletes both energy and motivation. 压力不仅消耗体力而且让你丧失动力。
- Scientists refute a longstanding theory of how HIV slowly depletes the body's capacity to fight infection. 科学家驳倒一个爱滋病毒如何慢慢地耗尽身体容量对抗感染的长时间理论。
- I help them acclimate to living in the U.S.我帮助他们适应在美国的生活。
- How much time does she need to acclimate?她需要多少时间才能适应？
- I would offer a caveat for those who want to join me in the dual calling.为防止发生误解，我想对那些想要步我后尘的人提出警告。
- As I have written before,that's quite a caveat.正如我以前所写，那确实是个警告。