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试述食管的三个狭窄及距中切牙的距离？
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简述子宫的位置及固定装置。
China formed the first ocean route in the world, which was from ________ to ________ in the history and known as the Maritime Silk Road.
One of the important characteristics of the Maritime Silk Road in Tang and Song Dynasties was that trade volume of _______ and _______ increased until it became dominant status.
In addition to business and trade, in Yuan Dynasty, the western ________ also came to China from the Maritime Silk Road in this period.
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