catch sb. with his pants down

例句：

1. 1. The thief caught the burglar in his arms.
   小偷抓住了窃贼。
2. 2. She caught a glimpse of the sunset over the sea.
   她瞥见了海上日落的景象。
3. 3. The dog caught the ball and ran back to its owner.
   狗抓到了球，跑回主人身边。