1. Visitors must remove their shoes or wear shoe covers to prevent damage to the marble floors.2. When I am working in the factory, I must wear booties to keep the floor clean.3. I have my dog wear booties in the winter because the floor is very cold.
 shoe covers bootiesshoe covers = booties = 可棄式鞋套，通常是為了衛生或保暖才會穿但 booties 有可能指長靴子，所以要有清楚的上下文，才知道是指什麼意思。
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 elting of glaciers, which leads to rising sea levels.