fling the gauntlet

例句：

1. 1. He flung the ball into the net with all his might.
   他全力将球扔进网里。
2. 2. She flung a glance at him and then looked away.
   她瞥了他一眼，然后转过脸去。
3. 3. The thief flung open the door and ran out into the night.
   这个小偷猛地打开门，跑进黑夜中。