Centuries passed before men understood why the compass needle always pointed in a north-south direction.
(Centuries; passed; T:before men understood why the compass needle always pointed in a north-south direction) (men; understood; ) Context(men understood,List([24, 38))):(the compass needle; pointed; L:in a north-south direction; T:always)
men understood,List([24, 38))
Centuries men the compass needle
passed understood pointed
T:before men understood why the compass needle always pointed in a north-south direction
L:in a north-south direction T:always