音标
英语音标：[wʌns]
美语音标：[wʌns]
翻译
conj.
一旦;一…就;当…时候
adv.
曾经;曾;一次;仅一次;(用于否定句、疑问句和if后)曾，根本
n.
一次
例句
She's planning to return to work once the children start school.
她正计划孩子一入学就恢复上班。
It made a refreshing change to be taken seriously for once.
总算有一次受到认真对待，这变化真是令人耳目一新。
If you can only exercise once a week, that's better than nothing.
即便是一个星期锻炼一次，也比完全不锻炼好。
