This paper, take the production of bellows for example, introduce the method of variable coefficient extension.
此文以波纹管生产为例，介绍了变系数拉伸法。
Take, for example, Petey Bellows, my roommate at the university. Same age, same background, but dumb as an ox.
就拿在明尼苏达大学跟我同住一个房间的皮蒂·伯奇来说吧，他跟我年龄相仿经历一样，可他笨得像头驴。
Take, for example, Petey Bellows, my roommate at the university. Same age, same background, but dumb as an ox.
就拿在明尼苏达大学跟我同住一个房间的皮蒂·伯奇来说吧，他跟我年龄相仿经历一样，可他笨得像头驴。
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