通过不断实践，他逐渐提炼出一套高效的工作方法。

Tōngguò bùduàn shíjiàn, tā zhújiàn tíliàn chū yí tào gāoxiào de gōngzuò fāngfǎ.

Through continuous practice, he gradually distilled an efficient set of working methods.

石油经过提炼才能变成汽油和柴油。

Shíyóu jīngguò tíliàn cáinéng biànchéng qìyóu hé cháiyóu.

Crude oil has to be refined before it can become gasoline and diesel.