Books exchange was an important content in cultural exchange between China and Korea in the 18th century.
北京琉璃厂书肆是这个时期中朝书籍交流的最重要的场所，从中国传入朝鲜的各种书籍，大部分购于琉璃厂书肆。 第六部分论述了十八世纪中朝文人之间的学谊。
参考来源 - 十八世纪中朝文化交流研究·2,447,543篇论文数据，部分数据来源于NoteExpress
同年，中朝正式签署了易货合同。
A barter contract between China and the DPRK was officially signed the same year.
你能知道马什么时候正在利用双目视觉，因为它通常会警觉站立，两耳集中朝向面前的一个物体。
You will know when a horse is using binocular vision because he will usually stand alert, with both of his ears focused on an object in front of him.
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