n.百萬噸級；兆噸
Inspite of the various difficulties,Chengdao was develoed independantly into a megaton oilfield in a period as short as a few years. 工程設計完全依靠自己的力量，克服了種種困難，在短短的幾年內(nèi)就將埕島建設成為一個百萬噸級的油田。
