VOA慢速英语:New Treatment for Sleeping Sickness

例句：He had forgotten the combination of the safe.
       他忘记了保险箱密码。

2.costly a.昂贵的,豪华的,价值高的

例句：The general's decision to invade was a costly mistake.
      将军作出的入侵决定是个代价惨重的错误。

3.shorten v.弄短,缩短,减少

例句：She shortened the skirt by an inch.
      她把裙子缩短了一英寸。

4.tiredness n.疲劳,疲倦

例句：Tiredness and despair were etched into his face.
      疲乏与失望刻在他的脸上。

5.identification n.鉴定, 验明, 认出，辨认

例句：The identification of rabies virus has saved many lives.
      狂犬病病毒的确认挽救了许多人的性命。

6.symptom n.症状,征候,征兆

例句：The doctor told her to watch out for symptoms of measles.
      医生叫她注意麻疹出现的症状。

7.advanced a.晚期的，后期的