读音

/ wʌns /

释义

• 副词: 一次，曾经。例如: “I saw him once in New York.”
• 连词: 一旦，如果…的话。例如: “Once you start, you won’t be able to stop.”

短语

• “once upon a time” 意为“从前”，常用于故事开头。
• “once in a while” 意为“偶尔，有时”。

例句

• 副词: “I visited that museum once a few years ago.”
• 连词: “Once you finish your homework, you can play video games.”

同义词

• one time
• at one time
• ever
• previously
• formerly