Chinese President Xi Jinping and Nepalese President Bidya Devi Bhandari jointly announced the new height of Mt. Qomolangma, which is 8848.86 meters, in letters they sent to each other on December 8.
老师您好，请问这里的letters后面省略了引导词吗？是where吗，引导定语从句。
in letters （that) they sent to each other on December 8.
省略的是作sent的宾语的关系代词！
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