“获得了两项自主知识产权！”3年前就想做的事，眼下终于有了突破性进展，河北鹰眼智能科技集团有限公司副总经理魏宝辉欣喜不已。
Consider what would happen if we really did delete the keys from the map, rather than leaving a tombstone. Here’s a playground where peers can add keys, but not delete them. Can you figure out how to get a peer to delete a key?
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Listen: Lindsay Foreman speaks to BBC before Iran jailing
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