a free or unrestricted means of admission or access
免费开放;自由进出
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being homeless is not an open door to decent housing .无家可归并不意味着能住上像样的住处。
the policy or practice by which a country allows the free admission of immigrants or foreign imports
门户开放(政策)
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[as modifier]
an open-door immigration policy .门户开放的移民政策。