如果你实在无法确定自己时候应该跑步，应在确保安全的前提下并给自己几天休息的时间——这并不会让你损失多少健康。
If you're really unsure about whether you should be running, play it safe and give yourself a couple days of rest - you won't lose much fitness at all.
这就让我们把注意力集中在如何在确保一流的用户体验的前提下，为设备创建应用程序。
This forces us to think about how to build applications for devices where the user experience is a first-class constraint on your design.
在确保安全的前提下，双方继续开展核能领域合作。
Under the premise of ensuring safety, both sides should continue to cooperate in the field of nuclear energy.
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