Anglais example sentences with "adventitious"

Adventitious roots are those which do not appear in the usual place on a plant.
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Someone with a positive manner, perhaps a detective, used the expression "mad man" as he bent over Wilson's body that afternoon, and the adventitious authority of his voice set the key for the newspaper reports next morning.
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His arrivals were always adventitious, leaving others little time to prepare.
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A rather adventitious source informed me of his past doings.
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