无须: need not, not obliged to, not necessarily...
上课: to go to class, to attend class, to go to teach a class...
难能可贵: rare and precious, valuable, remarkable...
波澜: billows, great waves (of a story with great momentum)...
市场经济: market economy...
景色: scenery, scene, landscape, view...
盘旋: to spiral, to circle, to go around, to hover, to orbit...
伤感: sad, emotional, sentimental, pathos...
下课: to finish class, to get out of class, (esp. of a sports coach) to be dismissed, to be fired...
招生: to enroll new students, to get students...
