曾经

zhè lǐ céng jīng nào guo shuǐ zāi

这里曾经闹过水灾。

A flood once occurred here.

tā céng jīng shuō guo zhè jiàn shì

他曾经说过这件事。

He had mentioned that matter before.

wǒ céng jīng dú guo zhè běn shū

我曾经读过这本书。

I have read this book before.

tā céng jīng lái guo

他曾经来过。

He came once before.

zhè bù yǐng piàn céng jīng hōng dòng yī shí

这部影片曾经轰动一时。

The film once caused a great sensation.

cháng ān céng jīng shì zhōng guó de zhèng zhì jīng jì wén huà zhōng xīn

长安曾经是中国的政治、经济、文化中心。

Chang'an was once the political, economic and cultural centre of China.

tā céng jīng cān jiā guo shí yóu huì zhàn

她曾经参加过石油会战。

She has taken part in a major battle for oil.

tā céng jīng zài shàng hǎi zhù guo

他曾经在上海住过。

He once lived in Shanghai.

wǒ céng jīng zài měi guó zhù guo liǎng nián

我曾经在美国住过两年。

I lived in the United States for two years.

tā céng jīng cān jiā guo xiào duì

她曾经参加过校队。

She once played for the school team.

tā men zài qián yī nián céng jīng jiàn guo yī cì miàn

他们在前一年曾经见过一次面。

They had met once the previous year.

měi guó de fǎ lǜ céng jīng bǎo hù guo nú lì zhì

美国的法律曾经保护过奴隶制。

American laws once protected the institution of slavery.