O [əʊ]

以下由轻松背单词网站提供

附加级

int. 哦, 哟, ... 啊, 唉, 哎呀(表示惊讶、痛苦、恐惧、赞叹等) num. 零

He didn't know that water and H?O are one. 他不懂水和H?O分子式是一回事。
I can't make out whether this letter is an e or an o. 我认不出这个字母究竟是e还是o。