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一[ yī ] 旦[ dàn ]
Vocabulary
一旦
[ yí dàn ]
Intermediate Level（Band 5）
How to Read
in a single day; in a very short time; in case [something happens]
1. 一旦开始，你就得继续。
[ yī dàn kāi shǐ ， nǐ jiù dé jì xù 。 ]
Once you begin，you must continue.