Number + 度
度 (dù) functions as a measure word meaning "time" or "occasion" and is used to count the number of times something occurs. It is more formal than 次 and often appears with 一 in the pattern 一度, meaning "once." For example, 每年一度 means "once a year" or "annual."
这个展览每年一度,已经办了十年了。
zhège zhǎnlǎn měi nián yī dù, yǐjīng bàn le shí nián le.
This exhibition is held once a year and has been running for ten years.
她曾一度想放弃,但最终还是坚持下来了。
tā céng yīdù xiǎng fàngqì, dàn zuìzhōng háishi jiānchí xiàlái le.
She once thought about giving up, but in the end she persevered.
这座城市一年一度的马拉松下周开始。
zhè zuò chéngshì yī nián yī dù de mǎlāsōng xià zhōu kāishǐ.
This city's annual marathon starts next week.