The rescue team heard a muffled voice from under the rocks and managed to rescue the victim who was trapped there for several days.
 muffled sound muffled voice
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 melting of glacier, which leads to rising sea levels.