Sentence:  As <WSD>time</WSD> has passed and science has progressed , the speed of military vehicles has increased , the range of missiles has been extended , the use of target-hunting noses on the projectiles has been adopted , and the range and breadth of message sending has increased . 
Meaning of the word marked with <WSD> tags:  the continuum of experience in which events pass from the future through the present to the past