one person in ten has no teeth left by the age of thirty 这个句

in one's thirties的意思是more than thirty 还是at the age of t in the age of by the age of at the age of的区别 by the age of He left school at the age of 14 同义句 英语翻译in two short years by the age of 23 The two ladies are of the same age,but one ( ) ten years old He left school at the age of 14 同义句 He left scho No one has succeeded in explaining the( )of how life began.A 6No one in the city _____ her before.A .have heard of B .has No one has yet succeeded in explaining the (problem?) of how No one has yet succeeded in explaining the ___ of how life b no one seems to know what has happen in the paek同义句转换