顽皮: naughty...
需求: requirement, to require, (economics) demand...
相互: each other, mutual...
路段: stretch of road, section of a highway or railway...
航运: shipping, transport...
优异: exceptional, outstandingly good...
开学: foundation of a University or College, school opening, the start of a new term...
温柔: gentle and soft, tender...
小于: less than, <...
这么: so much, this much, how much， this way, like this...
