watchful

a.注意的，警惕的

waste on, waste product, waste-basket (also `waste-bin), waste-paper, waste-pipe, wasteful, wastefully, wastefulness, wasteland, waster, wastrel, watch, watch out for, watch over, watch-dog, watch-night service, watch-strap (Brit) (US `watch-band), watch-tower, watchdog, watcher, watchfully, watchfulness, watching brief, watchmaker, watchman, watchword, water, water point, water polo, water ski, water-bed, water-bird, water-biscuit, water-borne, water-bottle, water-buffalo, water-butt, water-cannon, water-closet, water-colour (US -color),