重点讲解：
1. opt to do sth. 选择；作出抉择；
例句：Our students can also opt to stay in residence.
我们的学生也可以选择住校)+dhD^W&#h*r]0vrkW。
2. thanks to 幸亏；归因于；
例句：Thanks to recent research, effective treatments are available.
多亏近来的研究才有了有效的疗法[u_#JSLP2+Nif#7F。
3. as well as 除…之外；也；还；
例句：Love lives in cottage as well as in courts.
爱情不分贫贱与高贵^|M)cwSOO0。
4. be based on 以…为基础；
例句：The novel is based on his travels in India.
这部长篇小说是根据他的印度之行写成的vD502bAzwA.j。
5. year on year 年同比，与前一年同期比较；
例句：Even where prices are still falling year on year, markets are healing.
即使有些地方房价同比仍呈下降趋势，市场也正处恢复期Z(J_unUoR%^mcz。