事实上，后来的研究已经证明，在元素周期表中，元素不应该严格按照原子质量来排序。
In fact, subsequent work has shown that in a periodic table, elements should not be ordered strictly by atomic mass.
先前的研究已经证明失去几只工蜂能够毁灭整个昆虫社会。
Previous studies have shown that losing a few key workers can destroy an insect society.
但是许多研究已经证明雌激素治疗与乳腺癌的罹患和致死是有关联的。
But many studies have already linked estrogen therapy with increased risk of breast cancer and death from the disease.
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