1
1 + noun
在英语中，数字“1”用作限定词时，后接可数名词单数。
I have 1 apple.
我有一个苹果。
one
先理解核心含义，再看它在真实句子里的用法。
one
I have 1 apple.
我有一个苹果。
There is only 1 cookie left in the jar, so we should share it.
罐子里只剩下一块饼干，所以我们应该分享它。
If you add 1 to 9, the total is 10.
如果你把1加9，总数就是10。
She picked 1 card from the deck and turned it over.
她从牌堆里抽了一张牌，然后把它翻了过来。
在英语中，数字“1”用作限定词时，后接可数名词单数。
I have 1 apple.
我有一个苹果。
数字“1”也可用于指代“第一名”或“最佳”。
He is number 1 in the ranking.
他在排名中是第一名。
注意动词与主语一致：当“1 of + 复数名词”作主语时，谓语动词通常用单数。
1 of the students is missing.
学生中有一人缺席。
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Dictionary facts from ECDICT, WIKTIONARY, WORDNET.