homeland security

剑桥词典

[ 不可數或單數名詞：沒有複數形式的名詞 ]
activities and organizations whose purpose is to protect the US from attacks within the country by terrorists
（美國）國土安全（活動或機搆）
 Homeland Security

the department of the US government that deals with homeland security
（美國）國土安全部 返回 homeland security