Because sun breaks down its effectiveness over time, if you're going to be in direct sunlight for an extended period, reapply every hour or two.

因为阳光会逐渐减弱防晒霜的效果，如果你打算在直射的阳光下多待一段时间，每一两个小时重新涂一下防晒霜。

youdao

Every day is fun when I'm looking for my dream, because I know that every hour is part of the realization of the dream.

当我真心在追寻著我的梦想时，每一天都是缤纷的，因为我知道每一个小时都是在实现梦想的一部分。

youdao

Life teaches us not to despair even in the darkest hour, because after every night there is a day.

人生教会我们不要绝望，即使在最黑暗的时刻，因为每天晚上有一天。

youdao

This is bad because every realistically useful hour a Zipcar goes un-rented lowers its return on capital.

FORBES: Yes, it��s fair.

He said on 6 September the communications were down and there was only contact every hour between observation points because there were not enough batteries for the radios.

BBC: Para hit as craft tried to land

It was important to move quickly because the stakes were growing higher with every passing hour.

FORBES: Four Reasons Bitcoin Is Worth Studying