作者从大量口述史资料中提炼出三条贯穿全文的线索。Zuòzhě cóng dàliàng kǒushùshǐ zīliào zhōng tíliàn chū sān tiáo guànchuān quánwén de xiànsuǒ.From a large amount of oral-history material, the author distilled three threads that run through the whole text.
从石油中可以提炼出汽油、柴油等产品。Cóng shíyóu zhōng kěyǐ tíliàn chū qìyóu, cháiyóu děng chǎnpǐn.Petrol, diesel and other products can be extracted from petroleum.
他从失败中提炼出了宝贵的经验。Tā cóng shībài zhōng tíliàn chū le bǎoguì de jīngyàn.He distilled valuable lessons from his failures.