A small unmanned aircraft crashed on to the White House lawn early on Monday morning, triggering a lockdown of the building and presenting the type of security breach that could be a serious setback for the commercial use of drones.
一架小型无人机周一凌晨在白宫草坪坠毁，导致白宫整栋大楼被关闭。这类安全漏洞可能会给无人机的商用带来重大挫折。
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