一歲的英文是：One year old ，yearling 。

例句1：Many infants do not cut their first tooth until they are a year old. 翻譯：很多嬰兒到一歲大時(shí)才開始長(zhǎng)牙。 例句2：He was adopted by his eldest uncle when he was just one year old. 翻譯：他一歲時(shí)就出繼給大伯父了。一歲的英文是：One year old ；兩歲的英文是：Two years old ；三歲的英文是：Three years old ；四歲的英文是：Four years old ；五歲的英文是：Five years old 。一般我多少歲用語(yǔ)句 i am ... years old 來(lái)表示。