The higher the SPF, definitely the better.

防晒系数越高肯定越好。

At a minimum, you'll want SPF 30.

至少，你需要 SPF 30 的防晒霜。

And the amount of time spent outside is somewhat correlated to SPF.

在户外度过的时间多少与防晒系数有关。

These days, skincare and cosmetics companies are packing SPF into a variety of their products.

如今，护肤品和化妆品公司在各种产品中加入防晒剂。

Opt for a sunscreen with an SPF of at least 15, although 30 is better.

选择至少有SPF15的防晒产品，当然SPF30的会更好。

Ideally, you're using an SPF level that's between a 30 and a 50.

理想情况下，你使用的防晒指数在30到50之间。

So they're no better than about SPF 5.

它们的作用不到SPF5。

I forgot I have this lip balm with SPF 30.

我忘了我有一支 SPF 30 的润脣膏。

SPF 15 does a pretty good job by blocking 93% of UVB rays.

SPF15的防晒可以阻挡93%的b波紫外线。

How much should I pay attention to SPF?

我需要多在意防晒指数？