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1·I brush my teeth twice a day!

我每天刷两次牙！

2·Normally he performs his devotions twice a day.

通常他每天进行两次祈祷。《柯林斯英汉双解大词典》

3·I phoned twice a day, leaving messages with his wife.

我一天打了两次电话，留言给他妻子。《柯林斯英汉双解大词典》

4·I water my flowers twice a day.

我一天给我的花浇两次水。

5·He feeds the bird twice a day.

他每天喂这鸟儿两次。

6·It's good for you to brush your teeth twice a day.

一天刷两次牙对你有好处。

7·We are supposed to do exercise once or twice a day to keep healthy.

我们应该每天锻炼一两次以保持健康。

8·You should do eye exercises twice a day and examine your eyes in time.

你应该每天做两次眼保健操，并及时检查眼睛。

9·My doctor advised me to take the medicine twice a day, in the morning and evening.

我的医生建议我每天吃两次药，早晚各一次。

10·I know expert of that, but I think you can try lifting weights and do at least 200 sit-ups twice a day.

我知道这方面的专家，但我认为你可以试试举重并且做至少200个仰卧起坐，每天做两次。