economic lifeline的用法和樣例：
例句
- Transportation over water has always been the economic artery of Shanghai.
航運自古以來(lái)就是上海經(jīng)濟命脈。 - Commercially developed, Wuzhou was a commercial center and the economic lifeline of Guangxi in modern times.
摘要近代梧州商業(yè)特別發(fā)達，是全省商業(yè)之中心，曾一度控制著(zhù)全省的經(jīng)濟命脈，是廣西經(jīng)濟的重心。
