研究者提示说他们无法就此中因果关系提供任何相关理论，因为他们仅仅观察并比较了口服避孕药的妇女与不服避孕药的妇女。
The researchers noted that they could not offer any theories about cause and effect because they only observed and compared women who took the pill with women who did not.
近期研究提示，眼底动脉硬化能反映全身性微血管病变，并伴随心血管事件风险的增加。
Recent studies suggested that arteriolar retinopathy reflected systemic microvascular disease and was associated with increased risk of cardiovascular events.
本研究的发现提示并鼓舞继续改善营养状况的巨大潜力。
The changes observed in the present study are markedly encouraging and indicate great potential for progressive improvement.
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