1.doubtfully adv. 怀疑地, 含糊地

例句：
Gerald shook his head doubtfully.
吉拉德怀疑地摇了摇头。

2.existence n. 存在,生存

例句：
According to some philosopher, everything in existence is reasonable.
某位哲学家认为, 存在的事物都是合理的。

3.outline n. 大纲,轮廓,概要 v. 描画轮廓,描述要点

例句：
The flower was clearly outlined in the light of the lamp.
花朵在阳光下清晰地显现出轮廓。