ad·ven·tive /ædˈvɛntɪv/
(a.)外來的;非土長的
Ad·ven·tive, n. A thing or person coming from without; an immigrant. [R.]
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Ad·ven·tive a.
1. Accidental.
2. Bot. Adventitious.
adventive
adj : not native and not fully established; locally or temporarily
naturalized; "an adventive weed"