flu简单

Now utopia has grown unfashionable, as we have gained a deeper appreciation of the range of threats facing us, from asteroid strike to epidemic flu and to climate change.

如今乌托邦已不再流行，因为我们更深刻地认识到人类所面临的种种威胁，从小行星撞击到流行性感冒，再到气候变化。