When I was about four years old I had traveled by train.
大约在我四岁多的时候，我坐过火车。
They start reading when they are about three or four years old.
他们大约从三、四岁起开始阅读。
He recollects drawing pictures from about the age of three or four years old.
他回忆起自己大约在三或四岁就开始绘画了。
He recollects drawing pictures from about the age of three or four years old.
他回忆起自己大约在三或四岁就开始绘画了。
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