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我曾经去过北京。
wǒ céng jīng qù guo Běi jīng。
I have been to Beijing once.
他每周一次打篮球
tā měi zhōu yī cì dǎ lánqiú
He plays basketball once a week.
我之前去过一次美国
wǒ zhī qián qù guo yī cì Měi guó
I've been to America once before
我每周一次去超市
wǒ měi zhōu yī cì qù chāo shì
I go to the supermarket once a week.