Sievert (Sv): A measure of the effective dose—that is, the health effects of the radiation, with different types of ionizing radiation (gamma rays, X-rays, alpha particles, and so on) having different effects. One sievert equals 1 joule per kilogram weighted for the biological effectiveness of the radiation and the tissues exposed.
Authorization behavior:
，这一点在新收录的资料中也有详细论述
- `fa-brands.otf` and `fa-regular.otf` can be combined.
while (i * i) <= n {