While he was away from his desk, I took the opportunity to go through his drawers.
take the opportunity to do something白話的翻出即可.
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 meltng of glaciers, which leads to rising sea levels.