VOA慢速英语:Researchers: New Material Can Protect older adults

1. substance n.物质，材料; 实质，内容; [神]灵; （织品的）质地; 
例句：But the substance was slight.
但其实质内容却微乎其微。

2. osteoporosis n.[医]骨质疏松症;
例句：Osteoporosis causes bones to become weak and break easily.
骨质疏松症导致骨骼变弱和容易折断。

3. musculature n.肌肉组织;
例句：Breus said the bath will relax your musculature and increase your core body temperature.
breus说，洗澡会放松你的肌肉组织，并增加你的身体核心温度。

4. momentarily adv.顷刻之间，<美>马上，立刻;
例句：I felt momentarily safe in his arms.
我觉得暂时在他的怀里安全。

5. uNPRotected adj.无保护（者）的; 无防卫的; 不受关税保护的;
例句：Emergency contraception can prevent pregnancy after uNPRotected sex.
紧急避孕药可以在无保护措施的性生活后防止意外受孕。