Usages of yídàn
一旦 肥料 太 多， 根部 就 会 有 问题。yídàn féiliào tài duō, gēnbù jiù huì yǒu wèntí.
Once there is too much fertilizer, the root area will have problems.
一旦 叶片 发黄， 就 先 不用 施肥。yídàn yèpiàn fāhuáng, jiù xiān búyòng shīféi.
Once the leaves turn yellow, do not fertilize for the moment.
一旦 发现 虫害， 就 先 看 叶片。yídàn fāxiàn chónghài, jiù xiān kàn yèpiàn.
Once you discover a pest infestation, check the leaves first.
一旦 湿度 太 高， 就 需要 通风。yídàn shīdù tài gāo, jiù xūyào tōngfēng.
Once the humidity is too high, ventilation is needed.
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