The researchers also charted sound waves passing through nine quiet regions of the sun, where no sunspots were developing, and found no significant anomalies in the waves' travel time.
在无黑子活动的九个太阳宁静区，研究人员发现声波的传播时间没有这么大的变化。
If they were smart, the kids would try to find a quiet cove or harbour where there were no waves and start measuring.
如果孩子们够聪明的话，他们会试图找到一个平静的小海湾或者是海港，那里没什么海浪。
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