at short intervals 常常
- The graphic record shows three waves arriving one after the other at short intervals.
图形记录便显示了在短的间隙内先后到达的三种波。 - Buses leave at short intervals.
公共汽车不时地开出。 - The graphic record shows three waves arriving one after the other at short intervals.
图形记录便显示了在短的间隙内先后到达的三种波。
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