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.
一架小型無人機周一凌晨在白宮草坪墜毀，導致白宮整棟大樓被關閉。這類安全漏洞可能會給無人機的商用帶來重大挫折。
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