研究测定出，每吸一根烟平均寿命折损11分钟，这就意味着成为一名烟民50岁过后将预期寿命会缩短4年。
research has determined that every cigarette decreases one's life expectancy by 11 minutes, and being a smoker shaves four years off of one's life expectancy after 50.
三根互相啮合的螺杆，在泵缸内按每个导程形成为一个密封腔，造成吸排口之间的密封。
Three mutual engagement of the screw in the pump cylinder for each lead of the formation of a sealed chamber, causing the seal between the suction mouth.
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