来自LingQ课程库的示例
- rewarded, for suddenly I stumbled upon a place where I
- be concocted, had once stumbled upon it by accident, and
- high explosive, Perry had stumbled upon a fire-extinguisher that
- former expedition which had stumbled upon the vast ruins by
- virtually hidden until you stumbled upon them. The villagers, called
- grandson of Cadmus, accidentally stumbled upon her as she lay
