1. As he gets older his health goes downhill.2. The global economy is still going downhill despite aggressive efforts to repair it.
 go downhill get worse可以普遍用在很多情況
他越老健康越日漸衰退. 全球的金融一直再衰退, 即使大家都努力要讓它恢復.
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 grenhouse effect, which leads to melting of glaciers, which leads to rising sea levels.