Word一旦yídànMeaningonce; as soon asPart of speechconjunctionPronunciationCourseHardcore ChineseLessonCaring for indoor plantsUsages of yídàn一旦yídàn 肥料féiliào 太tài 多duō， 根部gēnbù 就jiù 会huì 有yǒu 问题wèntí。yídàn féiliào tài duō, gēnbù jiù huì yǒu wèntí.Once there is too much fertilizer, the root area will have problems.一旦yídàn 叶片yèpiàn 发黄fāhuáng， 就jiù 先xiān 不用búyòng 施肥shīféi。yídàn yèpiàn fāhuáng, jiù xiān búyòng shīféi.Once the leaves turn yellow, do not fertilize for the moment.