无人机的价值在于解决行业的痛点。
The joy of mathematics is in the struggle to understand.
I am a cage, in search of a bird.
"I'd never given much thought to how I would die, but dying in the place of someone I love seems like a good way to go."
人体对我来说是最重要的东西。
即使我输了，我也能从中学到东西。
Evolution is a slow process.
Free vaccines are more valuable than expensive treatments, yet harder to promote.