enlighten
vt.启迪;指导;教导
exceptionally
adv.极其;非常
severe
adj.很严重的;极为恶劣的;
restriction
n.限制;规定;约束
unbearable
adj.难以忍受的;承受不住的;无法忍受的;
troublesome
adj.引起麻烦的;令人烦恼的;带来麻烦的;
stubborn
adj.固执的;执拗的;倔强的;顽固的;
tendency
n.倾向;趋势;
superb
adj.极好的;卓越的
eyesight
n.视力