Not until you are in a certain time or certain occasion that you feel the truth.

不到一定的时间场合。

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This vacuum bottle can make temperature of the inside liquid constant in a certain time.

这种真空瓶又叫“杜瓶”，可使盛在里面的液体不论泠、热温度都保持一定时间内不变。

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A person to watch a city, to be in a certain time to meet carved in the city another person.

一个人守望着一个城市，只为在某时某刻能够遇见城市中的另一个人。

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The bill would free all slaves in the district who were born after a certain time.

VOA: special.2009.03.12

It began to infiltrate other disciplines and was in general a high-spirited horse for that certain period of time.

它逐渐渗入到其它学科,总之是那个时代的一匹黑马。

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It's actually better to spend a certain amount of time just keeping your body in good condition

其实花一定时间保持身体的良好状态更好，

健康生活 - SpeakingMax英语口语达人

At the same time, due to the crisis and to the difficulties which we had in our relations a certain time ago, this potential has not been tapped.

WHITEHOUSE: U.S.-Russia Business Summit

Shareholders, unlike bondholders, receive no legal promise to be repaid in cash at a certain time.

ECONOMIST: Stocks in trade | The

March 11 (Bloomberg) Brazil is considering new measures to stem gains in the currency, including a requirement that foreign investment in equity markets stay in the country for a certain period of time, said a government official briefed on the plans.

FORBES: Brazil Postpones Currency Measures (But They Are Coming)