Back Alley - Area between the back boundary line and the long service line for doubles.
单打端线和双打端线之间的长地带。
There is a boundary line over 4700 kilometers between China and its five South Asian neighbors and their exchanges can be traced back to more than 2000 years ago.
中国与5个南亚国家接壤，边界线长达4700多公里。中国同南亚国家的交往从2000多年前就开始了。
Conquering any difficulty always gives one a secret joy, for it means pushing back a boundary line and adding to one's liberty.
征服任何困难总会给人带来神秘的喜悦感，因为它意味着你突破了又一个界限，进入到一种自由的境界。
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