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?
人气：318 ℃ 时间：2020-05-29 14:02:47
解答
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.m...
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