周丘，（?—前154），西汉下邳（今江苏睢宁西北）人。
今年早些时候，秘鲁举行了马丘·比丘古城发现100周年的纪念活动。
Earlier this year, Perucelebrated the 100th anniversary of the scientific discovery of the citadel of Machu Picchu.
去年纽约州的锡拉丘兹市和康涅狄格州首府哈特福德市做了一项试验，让警察连续两周发出大量的法庭传票，使得两地边开车边使用手机的行为大幅减少。
Syracuse, New York, and Hartford, Connecticut, last year tried an experiment in which cops issued dramatically more citations for two weeks and mobile-phone use fell sharply in both places.
对单周控制丘克变换器的设计和分析进行了详尽的研究。
Detailed analysis and design of one-cycle-controlled Cuk converter are presented.
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