（四）Obliged/obligated, obligation, obligatory(compulsory), obliging
(1) Her kindness has placed/put/laid me under an obligation to her. 施恩惠给我
  Replay an obligation 还人情债
(2) be under an /no obligation to do sth.有/没有义务做
(3) fulfill/undertake one’s obligations履行/承担自己的义务/职责

（五）Pervert, perversion; perverse(ness), perversity; perverted, pervertible
Pervert, perversion
(1) All this violence on TV is perverting the minds of our young children.
(2) The new technology has been perverted to help cause destruction and war.
(3) Their traditional ceremonies were perverted into meaningless rituals.
(4) to pervert one’s talents/one’s powers for
(5) pervert the course of justice 枉法/滥用司法程序

perverse(ness), perversity
(1)        the perverse child; the perverse weather
(2)        a man of perverse nature
(3)        take a perverse pleasure in
(4)        a perverse/perverted view of liberty
(5)        the perversity of fate
(6)        Many tourists are not fully prepared for the perversity of the British weather.
(7)        Perversely, it started to rain when the game began.
(8)        Perverted custom/image/relationship/translation
(9)        Young people are easily pervertible.

（六）Lament, lamentable, lamentation
(1) lament for a friend/over the death of a young man
(2)        lament one’s carelessness/foolishness/one’s great loss/that
a lamentable performance/attitude

（四）Obliged/obligated, obligation, obligatory(compulsory), obliging
(1) Her kindness has placed/put/laid me under an obligation to her. 施恩惠给我
  Replay an obligation 还人情债
(2) be under an /no obligation to do sth.有/没有义务做
(3) fulfill/undertake one’s obligations履行/承担自己的义务/职责

（五）Pervert, perversion; perverse(ness), perversity; perverted, pervertible
Pervert, perversion
(1) All this violence on TV is perverting the minds of our young children.
(2) The new technology has been perverted to help cause destruction and war.
(3) Their traditional ceremonies were perverted into meaningless rituals.
(4) to pervert one’s talents/one’s powers for
(5) pervert the course of justice 枉法/滥用司法程序

perverse(ness), perversity
(1)        the perverse child; the perverse weather
(2)        a man of perverse nature
(3)        take a perverse pleasure in
(4)        a perverse/perverted view of liberty
(5)        the perversity of fate
(6)        Many tourists are not fully prepared for the perversity of the British weather.
(7)        Perversely, it started to rain when the game began.
(8)        Perverted custom/image/relationship/translation
(9)        Young people are easily pervertible.

（六）Lament, lamentable, lamentation
(1) lament for a friend/over the death of a young man
(2)        lament one’s carelessness/foolishness/one’s great loss/that
a lamentable performance/attitude