1. While osteoporosis can strike at any age, over half of all women over age sixty-five have it.2. Osteoporosis is a serious disorder that can lead to broken bones and even shorter life. Therefore, you should take enough calcium in your daily diet.
osteoporosisosteoporosis = 骨質酥鬆症
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 probles. 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.