在调查之前，已经完成了一个新的轻型城市轨道交通系统的建设，第二个在轨道的完成后12个月到18个月建设。
One survey was done before the city had finished building a new light rail system, and the second was done from 12 to 18 months after the rail's completion.
我们必须把,每一个放入简并的轨道,我们把每一个电子放在p轨道里，所以把规则记在脑子里,我们把每一个电子放在p轨道里,在我们放入第二个电子之前。
Remember we have to put one in each degenerate orbital before we double up on any orbital, so just keep that rule in mind that we would fill one in each p orbital before we a to the second one.
这张照片是在今年2月份，卡西尼号宇宙飞船从卡里索普上方快速飞过时拍摄到的。 卡里索普星的轨道在土星第二大卫星特提斯的后方，二者围绕土星旋转的轨道大致相同。
The Cassini spacecraft snapped this shot in February as it swooped past Calypso, which trails behind the larger moon Tethys in roughly the same orbit around Saturn.
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