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1·He picked up two plastic buckets and rushed to the center of the village, where a fire engine arrives once a day to provide water for residents.

他提起两个塑料水桶奔向村子的中心位置，消防车每天都会来这里一次，为居民们提供水源。

2·Not once a day, but twice a day.

一天还不止一次，两次。

3·Take two tablets once a day.

每天服用一次，一次两颗。

4·The page only changes once a day.

页面每天只能改变一次。

5·Brush twice a day, and floss once a day.

一天刷牙两次，用牙线洁牙一次。

6·When I say this, I mean at least once a day.

我的意思是至少一天一次。

7·Not once a day, but twice a day. Sometimes three.

不是一天一次，而是一天两次，甚至是三次。

8·And just do it once a day, for 30 minutes or so.

并且每天只花30分钟去这样做。

9·In addition, you should floss at least once a day.

此外，你每天至少要用一次牙线。

10·I currently check my stats once a day out of habit.

出于习惯，我目前每天察看一次网站统计。