Sunscreen doesn't actually work the way you think. First of all, most of them don't do anything and so you're wasting your time. If you're not buying a sunscreen that contains both zinc oxide and titanium dioxide, you're wasting your money. You also need to make sure you understand what an SPF rating is. SPF isn't like a sunscreen power level, but rather what determines how long the sunscreen will last before you need to reapply it.
防晒霜实际上跟你想象的并不一样。首先，大多数防晒霜并无任何效果，因此你是在浪费时间。如果你没有购买既含氧化锌又含氧化钛的防晒霜，那么你就是在浪费金钱。你也需要确定自己理解SPF值是什么。SPF并不说明防晒功效的等级，而是决定涂一次的防晒效果能维持多久。