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- By the age of seven he could write beautifully. 他七岁时字就写得很漂亮了。
- In some sports you're past it by the age of 25. 在某些运动中，人过25岁就难有作为了。
- By the age of 40, Beethoven was completely deaf. 贝多芬在四十岁时全聋。
- Autism generally appears by the age of three. 孤独症通常出现在三岁左右。
- At the age of thirteen, Tom was left penniless by the death of his father, so he had his own way to make. 在13岁时汤姆的父亲死了，没留分文给他，所以，他得自食其力。
- By the age of 21 he controlled the company. 他21岁就掌管了公司。
- Children ought to be able to read by the age of 7. 儿童7岁时应该识字了。
- By the age of 10 he had played the piano. 在10岁的时候他已经学会了弹钢琴。
- By the age of forty, he had become famous. 岁之前他就成名了。
- By the age of sixteen, he had learned to drive a car. 到十六岁时候,他已经学会了开车。
- By the age of 13, he had made up his mind to sing professionally. 到13岁时，他已决定进行专业演唱。
- By the age of 70, he understood the play of the real world. 年届七十，他才读懂了现实世界的行动准则。
- By the age of fourteen, he had learned advanced maths. 到十四岁时,他已学习高等数学。
- By the age of ten, he had learned to play the piano. 岁的时候,他就学会了弹钢琴。
- The age of a tree is told by the number of the rings in the wood. 树的年龄是从木头上圆环状条纹的圈数而得知的。
- She was already performing in competitions by the age of ten. 她在十岁时就已经开始参加比赛了。
- By the age of two most children have begun to communicate verbally. 大多数孩子两岁时就开始用说话沟通。
- His ambition is to be at the wheel of a large corporation by the age of forty. 他的抱负是要在四十岁时控制一家大公司。
- By the age of 6,he had covered hundreds of sheets of paper with his drawings. 到了六岁，他已画了几百张纸的画稿。
- By the age of 25 she was completely burned out and retired from the sport. 她到25岁时就已体力耗尽，退出了体坛。
