The reason for a leap day or a leap year is because our calendar does not follow the Earth's orbit around the sun exactly.
闰日或闰年出现的原因是我们的历法并不精确地遵循地球围绕太阳运行的轨道。
It was a giant leap suddenly to argue that the Earth orbits the sun, rather than the other way around, particularly without telescopes.
要知道当时尤其是在没有望远镜的情况下，突然声称地球围绕太阳运动而非相反是多么巨大的飞跃。
Though he’d lost his precious limbs, he was not downhearted. Unable to leap and run, he moved around by crawling, and still enjoyed every day in a lively and cheerfully manner.
虽然太郎失去了宝贵的四肢，但是他并没有意志消沈，而是用匍匐前进来代替奔跑跳跃，活泼乐观地过着每一个日子。
The computer makes possible a marvellous leap in human proficiency; it pulls down the fences around the practical and even the theoretical intelligence.
计算机使人类能力上的巨大飞跃成为可能；它打破了束缚实践智能和理论智能的藩篱。 但是计算机是使人类更容易还是更难以理解自己究竟是什么，是否有助于识别真正的问题，有助于对美作出更全面的反应，对生活作出更充分的评价？
The hardest moves to compute are those of the knight, for it can leap over and around other pieces, and the moves are not in a straight line or diagonal like all of the other pieces.
最为困难的是计算马的步法，因为它跳跃其他棋子，而且它不像其他棋子那样走直线或对角线。
Microsoft is better prepared this time around, but even if the downloads go smoothly, there are a few things you need to know before making the leap.
这一次微软正准备做的更好，但是即使下载顺利，在飞跃之前你还需要知道一些事情。
It’s hard to make that leap to, “Even though I’d never dump my trash on the ground, my use of it contributes to the amount that’s lying around.”
人很难会产生这样的联想--“尽管我从没把垃圾倒在地上，但是我制造的垃圾导致了大量的垃圾被倒在地上。”
As it is, though, we now have to leap forward to around 1200 BC to find China's first historical rulers, the Shang Dynasty.
不过，我们现在要循着历史向前出发，前往公元前1200年，去寻找中国有记载的第一代统治王朝--商朝。
Our leap year system-which adds an extra day to the calendar every four years-ensures our calendars are accurate, but it also causes the solstice date to flop around a bit.
我们的闰年计算方法，即每四年就在日历上额外增加一天，以保证我们历法的准确性，但这也导致至日日期有点变化。
Our leap year system-which adds an extra day to the calendar every four years-ensures our calendars are accurate, but it also causes the solstice date to flop around a bit.
我们的闰年计算方法，即每四年就在日历上额外增加一天，以保证我们历法的准确性，但这也导致至日日期有点变化。
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