1. What's the matter with you? Why do you look like you are in pain?2. When I stepped into the room, my parents looked serious as if I had made a huge mistake.
 look like you are in pain look serious, sad, uncomfortable, etc.指你生理的不舒服所造成的臉色難看, 指各種的情緒所造成的臉色難看.
1. 你怎麼了, 臉色怎麼這麼難看?2. 當我進房間時, 我父母的臉色很難看, 好像我犯了什麼滔天大錯一樣.
這是一個連環問題: 燃燒石油導致二氧化碳增加，二氧化碳增加導致溫室效應，溫室效應導致冰層融化、海平面上升。 (請填空)
This is a chain of problems. Burning oil leads to increase in carbon dioxide, which leads to the greenhouse effect, which leads to meltig of glaciers, which leads to rising sea levels.