网站上有解释这个问题啊：
Imports reported by one country do not coincide with exports reported by its trading partner. Differences are due to various factors including valuation (imports CIF, exports FOB), differences in inclusions/ exclusions of particular commodities, timing etc.

昨天也发现了一样的问题，所以想跟楼主探讨一下，下一步准备怎么统一数据？我研究的是二元边际，想都用进口国为reporter的数据