The main culprit, LDL (for low-density lipoprotein), is the body's oil truck, circulating in the blood, delivering fat and cholesterol to the cells.

主要的“罪犯”是低密度脂蛋白胆固醇，它是身体的运油车，在血液里向细胞传输脂肪和胆固醇。

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With an eye on the oily sludge in Chinese oil fields, a kind of differential density circulating fluidized bed combustion technology for treating oily sludge is proposed.

针对我国油田的油污泥情况，提出一种采用异密度循环流化床燃烧技术处理油污泥的方法。

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A small volume of fluid, often of a higher density than the main body of fluid, within the circulating or production-fluid system that influences the flow or production characteristics of the well.

在循环系统或产出流体系统内部的小体积流体，其密度通常高于主体流体，其作用是影响井的流动特性或生产特性。

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Epidemiologic studies over the past 40 years have identified numerous risk factors for breast cancer, including: older age, an early age at menarche, a late age at first full-term birth, not having children, a family history of breast cancer in a first-degree relative, greater height, higher circulating estrogen levels, postmenopausal hormone use, breast density, history of breast biopsies, obesity (for postmenopausal breast cancer), and exposure to ionizing radiation.

FORBES: After 40 Years Of Research, What Do We Know About Preventing Breast Cancer?