经年乘坐飞机旅行的人都会切身感受到喷气发动机在过去几十年里的变化。
THAT jet engines have evolved over the past few decades will be apparent to any seasoned air traveller.
目的探讨女性高血压患者绝经前后及绝经年限与血脂变化的关系。
Objective To investigate the effect of pre - and post-menopausal periods and menopausal-age limit on lipid metabolism in hypertensive women.
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