once a day 每天一次;一天一次
- Rub in this cream once a day.
每日一次把这乳剂用力擦入。 - Put a plaster on the sore once a day.
把这膏药每日一次敷贴患处。 - In one experiment, scientists had volunteers approached and touched mockingbird nests once a day for four days.
在一个实验里,在四天中科学家们请志愿者每天接近并触碰嘲鸟巢一次到。
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