勇敢
奋斗
沮丧
乐观
struggle ['strʌg(ə)l]：vi. 奋斗，努力；挣扎 n. 努力，奋斗；竞争 vt. 使劲移动；尽力使得
例句：They had to struggle against all kinds of adversity. 句意：他们不得不同各种困境斗争。
