Experts advise that sunscreen should be reapplied on an hourly basis.专家建议防晒霜应该每小时都小时都重新重新涂抹.I use a sunscreen whenever there is even a remote possibility that I will be in the sun.不论何时只要有一点可能暴露在阳光下，我就会用防晒霜。Re-apply sunsc...
Re-apply sunscreen every two hours, especially if you have been swimming.每两个小时重新涂一次防晒油，尤其是在游泳的时候。I use a sunscreen whenever there is even a remote possibility that I will be in the sun.不论何时只要有一点可能暴露在阳光下，我就会用防晒霜。Experts a...