单词：Cascade Systems
【机械工程】 串联系统，级联系统
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[00:06.48]READING [00:07.26]A SACRIFICE FOR LOVE (1) [00:08.86]One dollar and eighty-seven cents. [00:11.86]That was all. And sixty cents of it was in pennies. [00:14.81]Pennies saved one or two at a time by bargaining at the grocery, [00:18.29]at th
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