• In the center,at ground level, is a round pool of water.

    VOA: special.2009.05.25

  • So if we go to the ground state, what you see is we're at that lowest energy level, and we only have one possibility for an orbital, because when n equals 1, that's all we can do.

    如果我们在基态上,你可以看到,我们在能量最低的态上,只有一种,可能的轨道,因为n等于1,只有这种可能。

    麻省理工公开课 - 化学原理课程节选

  • Later,we visit rooms below ground level.

    VOA: special.2009.11.16

  • And the fields are commonly divided between level ground and a mountainside.

    VOA: special.2010.04.13

  • WMO scientists assess and monitor air pollutants such as ground-level ozone,smog, particulate matter, sulfur dioxide and carbon monoxide.

    VOA: standard.2009.03.23

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