A cursory examination or reading of something is very quick, incomplete, and does not pay close attention to detail.
A piece of writing is discursive if it includes a lot of information that is not relevant to the main subject.
A first event is a precursor to a second event if the first event is responsible for the development or existence of the second.
An excursion is a short trip or outing from which you return home fairly quickly.
An incursion is an unpleasant intrusion, such as a sudden hostile attack or a land being flooded.
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