once

/wʌns/📚 1191 19 5雅思中考高考

If something happens once, it happens one time only. ^一次

adverb [频率副词]一次，一回；曾经，一度；任何一次，从来；乘以一

conjunction [关联连词]一.....就，一旦

noun [抽象名词]一次

once 出现在下面的课文中: 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 29 Taxi!

近义词twice/twaɪs/^{adv. 两倍；两次}

词组	含义	例句
at once	立刻，现在，马上：表示需要立即采取行动或完成某事；	Tell the doctor to come at once. She is having a baby.^{告诉医生立刻过来。她正在生孩子。}
at once	同时，同时进行	Can you pat your head and rub your belly at once? He tried to eat four cookies at once.^{你能同时拍头和搓肚子吗？他试图一次吃四块饼干。}