Teeth need to be check once every two years.中的once是什么意思,起身作用?在线等
人气：369 ℃ 时间：2020-02-03 22:08:00
解答
在此句中,once意为“一次,一回”
Teeth need to be check once every two years牙齿需要每两年检查一次.
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