1．报送时机：船舶进入上述区域前开始报送，船舶离开上述后取消报送。
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当前紧张局面集中在钇、钪等稀土家族中的“小众元素”上，这些元素在国防技术、航天工业及半导体制造中虽用量极小，却起着难以替代的关键作用，而其生产几乎完全依赖中国。，详情可参考heLLoword翻译官方下载
You'll also find some other options like。关于这个话题，91视频提供了深入分析