1 He began to write poems in his thirties.

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1 He began to write poems in his thirties.
问：最后为什么用thirties而不用thirty?
2 When he moved to England in the fifties,he was already in his forties.
问：为什么fifty和forty都用复数?
3 A nucleus is about one millionth the size of an atom.
问：为什么用millionth而不用million?

12题的用法是短语 in one's thirties/fifties...数字复数,这个是表示在某人多少岁时,例如,在他三十几岁时,但没说明确切是几岁,只是31－39里边的一个数字而已.
3的意思是核子大约是原子的百万分之一.这里表示分数的.millionth就是百万分之××的意思.你要用million的话就要用 one in one million这样表达.

1 He began to write poems in his thirties. He began to work in his thirties是什么意思? his career began to take off in his later thirties He went to Paris in his thirties.为什么用thirties,thirties什么意思, 英语翻译1 Inhis thirties.Confucius began to teach.2 He is a grea He took a pen ( ) his pocket and began to write. He is () his thirties “in his thirties"是什么意思? He like writing poems in his free time because he wants to b 翻译He is in his teens / twenties / thirties /… He began to write his own newspaper when he was fifteen year He began to learn Chinese in his _____.