thirty是一個(gè)基數(shù)詞，整十的基數(shù)詞變序數(shù)詞時(shí)，一般要先變y為i再加eth，也就是說thirty的序數(shù)詞是thirtieth。
例句：
By this time he was thirty.
到那時(shí)他30歲了。
They left thirty minutes ago.
他們?nèi)昼娗半x開了。
I spent thirty yuan on this book.
我三十元買了這本書。
2024-09-10
thirty是一個(gè)基數(shù)詞，整十的基數(shù)詞變序數(shù)詞時(shí)，一般要先變y為i再加eth，也就是說thirty的序數(shù)詞是thirtieth。
例句：
By this time he was thirty.
到那時(shí)他30歲了。
They left thirty minutes ago.
他們?nèi)昼娗半x開了。
I spent thirty yuan on this book.
我三十元買了這本書。