1.serious illnesses 大疾病

例句：But I'd say something because it can be an important symptom in many serious illnesses.

史密斯说，“但是（遇到这种情况）我要说点什么，因为它可能是许多严重疾病的症状g8e-G#iVjQ3ey*~4(P^a。”

2.fell in love with 爱上

例句：He used to drive me around in his London taxi and I fell in love with this extraordinary man.

他过去常常用他的伦敦出租车带着我到处逛，我就慢慢爱上了这个不平凡的人3WuTe|ByoAPw。

3.decide to 决定

例句：It all depends on what you decide to believe.

这一切都取决于你决定要相信什么K+y@PRyR&*EN[tiW。

4.as well as 不但…而且

例句：A teacher should entertain as well as teach.

教师不仅要教书，也要引起学生兴趣AYg^yv![#7qyC=.。