To find reliable answers to questions about something as infrequent as brain cancer, a whole country's worth of data is needed.
要给脑癌这样罕见的疾病找到可靠结论就需要整个国家的统计数据。
He moved on, aimlessly, and in a little while the houses thinned, and the passers-by were infrequent.
他漫无目的地继续往前走,没过多久,房屋渐渐变得稀少,过路的人也不多了。
In temple precincts, small sculptures of dragons spouting water into a basin are not an infrequent sight.
在寺庙专用区,水流到某一流域的龙的小雕塑不能说是一种罕见的景观。
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