The little bamboo tree had been growing underground for the past four years, in the fifth year and beyond, it developed a root system strong enough for its ground growth.
过去的四年里，这株小竹子一直在地下生长，第五年开始，它形成了足够强大的根系，可以在地面生长。
Another solar system has a planet 22 times the mass of Earth, orbiting every four days, and a Saturn-like planet with a 3-year period.
另一个太阳系有一颗质量是地球22倍的行星(译者：可怜的小地球)，公转周期为4天，还有一颗公转周期为3年的类木星行星。
For ordinary people, more obviously valuable is a four-year-old system for homeowners to assess property tax online, rather than have crooked inspectors visit their homes.
对于普通的人，最有明显价值的是一个用了4年的系统，该系统让屋主在线评估物业税，而不是让心思不正的监察员登门拜访。
After the approval of the Ministry of education, South China Normal University and East China Normal University set up audio-visual education degree, a four-year school system.
经教育部批准，华南师范大学、华东师范大学开设电化教育本科专业，学制四年。
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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