But scientists reported that the evidence was stronger when they combined the results of the four major studies done so far.

VOA: special.2009.08.12

These studies were done in France with four-day-old babies.

这些实验在法国对四天大的婴儿进了研究

耶鲁公开课 - 心理学导论课程节选

But researchers reported recently that the evidence was stronger when they combined the results of the four major studies already done.

VOA: special.2009.09.22

Recent studies say four hundred or more people died that night.

VOA: special.2009.11.11