用英语写一篇关于郑和下西洋的简介字数在120左右,不好意思，不是写简介，是写经过。 英语
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【答案】 It took Zheng He 28 years to lead 7 ocean journeys in total.
He used passes,ocean maps and other things to help him find new places.
He went on his ocean journey with over 200 ships and about 27000 people each time.
On ihs journeys,the biggest ship was about 151.8 meters long and 61.6 meters wide.
He visited more than 30 countries and areas.
He made the ocean journeys in order to develop trade and friendship between China and other countries.