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 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 forty, he had become famous.
岁之前他就成名了。
By the age of21 he controlled the company.
他21岁就掌管了公司。
He was going to be dead by the age of 23.
估计活不到二十五岁就得死
By the age of 40, Beethoven was completely deaf.
贝多芬在四十岁时全聋。
A casual drinker by the age of14.
她14岁时不经意间成了个酒徒。
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 seventeen I was a full-fledged atheist.
到十七岁时，我已经完全成为一名无神论者。
By the age of six I had attended both of my parents second marriages.
六岁的时候，我分别参加了父母的第二次婚礼。
By the age of 16, his dream was to play basketball professionally in the NBA.
他16岁时的梦想是到NBA打职业篮球赛。
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。
By the age of40, some people are already experiencing breathlessness.
到40岁时，有些人已经感到气绝。
By the age of 10 he had won his first British Karting championship.
十岁时，他赢得了他的第一个英国小型赛车比赛冠军。
By the age of 15, I was filled with a desire to leave the chaotic comfort of the camp behind.
到了17岁，我一心渴望脱离这既混乱又舒适的营地。
By the age of25 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。
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 12 or 12, they'd become beggars and drug addicts.
他们12或14岁，成了乞丐和瘾君子。
If he does not have the dwarfism, then by the age of five he will be taller than me.
如果他没有侏儒症, 五岁他就会比我高。
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