161. Unendurable=insufferable a.难以忍受的(if you say something is insufferable, you are emphasizing that it is very unpleasant and annoying a.恼人的，讨厌的)

　　162. Undoubtedly adv.毋庸置疑的=as no doubt

　　163. Although=albeit conj.虽然(the same as although)

　　164. Unwilling a.不情愿的=grudging (a grudging feeling or action is felt or done very unwillingly)

　　165. Hardly=scarcely (you use scarcely to say that something is not true or is not the case, in a humorous or critical way)

　　166. Courage=nerve (nerve is the courage you need in order to do something difficult or dangerous)

　　167. Generally=as a rule adv.通常地

　　168. Understand=discern (if you can discern something, you are aware of it and know what it is)

　　169. Obviously=transparently (easily understand or recognize)

　　170. Define as=address as