It turned out my son was an early talker so by the time his second birthday arrived we had the main data set we wanted.

事实证明我儿子属于学说话很早的孩子，所以到他两岁生日的时候就已获取到了我们所需的主要数据。

Every four years. There are two main sets of Games -- the Winter and the Summer Olympics, and both are held every four years on a regular basis.

四年一次。有两种主要的运动会形式--冬季和夏季奥运会，并且在一个有规律的基础上他们都是四年举办一次的。