1. 无意中发现：stumble across 偶然发现 | stumble on 无意中发现 | stumble upon 偶然发现
2. 无意间发现：constantly:经常地 | stumble on:无意间发现 | sniff:闻
3. 偶然遇到,碰巧找到：1187stumblen. 绊倒,失策; v. 使绊倒,失策 | 1188stumble on偶然遇到,碰巧找到 | 1189stumpn. 残株,烟蒂,讲演台; v. 砍断,蹒跚而走
4. 偶然遇到：refute 驳斥,驳倒 | stumble on 偶然遇到 | tumble to 明白,领悟
1. His biggest stumble came in the second game of the final set, when he slipped and fell chasing a shot and scraped his knee on the clay.
2. Alito withstood sharp Democratic attacks on his judicial record and personal credibility without a major stumble during confirmation hearings this month.
3. You may stumble on a small fortune if you keep your eyes open for the faces on the cards and those around you.
4. stumble on
4. Think of those who stumble on the running track or fall from the bars.
5. He had no chance to stabilize himself, his left leg crossing over the right and sending him on a sickening stumble.
6. And a major future stumble by the president on a national security crisis could still change the picture before the next election.
7. I've been told the Stumble Inn has a quiz on Tuesday nights, but that I won't leave it sober.