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• An artificial kidney these days still means a refrigerator-sized dialysis machine. Such devices mimic[...]real kidneys[...]. But they are nothing like as efficient, and can cause bleeding, clotting and infection—not to mention inconvenience for patients, who typically need to be hooked up to one three times a week for hours at a time.
• An efficient process would automate all the routine work.
• Our cleaners are almost too efficient: they throw away anything left out on a desk.
• The motor is only 20% efficient at that temperature.
• The efficient cause is the working cause.