There was imperative need to be constantly alert; for these dogs and men were not town dogs and men.
He even went out of his way to bully Buck, striving constantly to start the fight which could end only in the death of one or the other.
He kept Francois busy, for the dog-driver was in constant apprehension of the life-and-death struggle between the two which he knew must take place sooner or later; and on more than one night the sounds of quarrelling and strife among the other dogs turned him out of his sleeping robe, fearful that Buck and Spitz were at it.
For three days Perrault and Francois threw chests up and down the main street of Skaguay and were deluged with invitations to drink, while the team was the constant centre of a worshipful crowd of dog-busters and mushers.
He plunged about in their very midst, tearing, rending, destroying, in constant and terrific motion which defied the arrows they discharged at him.
There are no more uses of "constant" in the book.
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The history of computers is a history of constant technological advancement.