Moreover, they will also be keeping a close eye on the sites' surface and atmospheric characteristics in order to gauge their safety for the landing system and rover.
此外，他们还要密切留意这几个地点的地表和大气特征，以确保着陆系统和探测器的安全。
Day and night they kept close watch on the city gates in order to kill him.
他们又昼夜在城门守候要杀他。
If they orbited each other any more quickly, say, on the order of three minutes per orbit, the stars would pull so close that they would begin siphoning helium off one another.
假如它们相互绕轨道运行得更快一些，譬如说，绕轨道运行一周的时间降为3分钟，那么这一对白矮星就会相互牵引得过于靠近，而开始从另一个中抽取氮气。
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