尽管总体上看，这种对癌症警惕的持续观察是一件好事，但研究人员越来越怀疑，是否所有这些检查对老年人来说都是必要的。
While such vigilant tracking of cancer is a good thing in general, researchers are increasingly questioning whether all of this testing is necessary for the elderly.
研究人员检查了这些儿童的脸颊细胞，以寻找环境对基因影响的迹象。
The children's cheek cells were examined for signs of environmental influences upon genes.
在1984年的一次实验中，哥本哈根大学的研究者对从患重感冒的病人身上取出的鼻组织进行了活组织检查，接着该病人康复后又进行了同样的检查。
In one experiment in 1984, researchers at the University of Copenhagen performed biopsies on nasal tissue taken from people suffering severe colds, then did the same after the subjects had recovered.
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