sporadic meteor

例句：

1. 1.The weather is sporadic and can change unexpectedly.
   天气是不规则的，可能会突然变化。
2. 2. The schedule for the event was sporadic, with some days being canceled.
   活动的日程安排很不规则，有些日子被取消了。
3. 3. The team's performance was sporadic, with many errors in their games.
   团队的表现很不稳定，比赛中有很多错误。