My job was to build a stairway out of rock. This meant climbing up and down the side of a mountain inhabited by mountain lions， although I should say they were only heard never seen.工作室用延时建造楼梯，这意味着我要在美洲狮栖息的山边爬上爬下，虽然准确说只是听说，狮子从来没有被看见过。
I will take the umbrella to Tom， he forgot it this morning.总:英语是一个比较主观的语言，说话者多以自己为视角向外扩展，这样也就更能理解这几个词的使用场景了。
