1. "My mom has been harping on me for getting a job during summer. It's driving me nuts!"2. "He was always harping on the importance of taking vitamin supplements."
Harp on"Harp on" 是貼切的說法!
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 chin of problems. Burning oil leads to increase in carbon dioxide, which leads to the greenhouse effect, which leads to melting of glaciers, which leads to rising sea levels.