因此添加不同比例的空心玻璃微珠就能够得到你所想要的理想密度。
Hence the desired ideal density can be obtained by adding appropriate proportions of hollow glass microspheres.
在美国，道路最佳使用效率的理想车辆密度大约是每车道英里50辆车。
In America, the optimum density for the best use of road space is around 50 vehicles per lane-mile.
相反如果整体风险很低，即使他们的低密度脂蛋白较理想的数值还高，他们也不应该服用他汀类药物。
Patients with low overall risk might not get a statin, even if their LDL reading is higher than ideal.
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