adverb [频率副词] 一次， 一回；曾经，一度；任何一次，从来；乘以一
I met Miquela once, briefly. 我见过蜜凯拉一次，时间很短。
conjunction [关联连词] 一.....就， 一旦
The water is fine once you're in! 一旦你进入里面，水就很好喝了！
noun [抽象名词] 一次
He only did it the once. 他只这么做过一次。
- once 出现在下面的课文中（提供视频、音频及笔记等可系统性学习）
- Lesson 32 Shopping made easy once 副词: 曾经，以前
- Lesson 099&100 Ow!
- Lesson 105&106 Full of mistakes
- Lesson 6 Percy Buttons
- Lesson 19 Sold out
- Lesson 28 No parking
- Lesson 41 Do you call that a hat?
- 网友用 “Once” 造句精选
- I lived there once myself, before I got married. 我从前自己住在那儿，没结婚前。
- Amy picked up the hairbrush and brushed her hair once more. 艾米拿起梳子，又梳了一遍头发。
- The decision had taken about 10 seconds once he'd read a market research study. 他读完一份市场调研报告后，10秒钟就做出了决定。
- I visited once or twice. 我参观过一两次。
- Lung cells die and are replaced about once a week. 肺细胞约每周死亡、更新一次。
- Remove from the heat, add the parsley, toss and serve at once. 从火上端下来，加入香芹，搅拌后立刻上桌。
- I once went camping at Lake Michigan with a friend. 我曾和一个朋友去密执安湖野营。
- We have to resolve this matter once and for all. 我们必须彻底解决这件事情。
曾经, 以前
① once = long long ago 很久以前
② once 一次
- I visited my mother once a month. (一次)
③ once 连接从句，表示“一旦”
- Once you leave my company, you must return the house.