During the first twenty years of service, the average time from New York to Liverpool was 23 days and the average trip back to New York took 40 days. (Passage Three)

【参考答案】

在投入使用的最初二十年里。从纽约到利物浦的平均时间为 23 天，而再返回到纽约的平均时间为 40 天。