【英语时差8,16】骨质疏松-上
时间：2019-02-15 作者：英语课 分类：英语时差8，16
Today’s word is: osteoporosis! Yep, osteoporosis. Now, you’ve heard this word before, and you know it has something to do with bones. But can you actually explain what it is? The answer is straight-forward. It comes down to the fact that we human beings need calcium 1 in our blood–it allows us to do all sorts of neat things, from contracting muscles to conducting nerve impulses. Where to get some calcium? Food is a good idea. But what if there isn’t always calcium-rich food to be had, as was probably the case for most of our long evolutionary 2 history? Best to store some for a rainy day. Store it where? The skeleton works! Then, when the blood runs low on calcium, a signaling device called the parathyroid gland 3 can activate 4 a process by which calcium is taken from the skeleton and put back into the blood.
- We need calcium to make bones.我们需要钙来壮骨。
- Calcium is found most abundantly in milk.奶含钙最丰富。
- Life has its own evolutionary process.生命有其自身的进化过程。
- These are fascinating questions to be resolved by the evolutionary studies of plants.这些十分吸引人的问题将在研究植物进化过程中得以解决。
- This is a snake's poison gland.这就是蛇的毒腺。
- Her mother has an underactive adrenal gland.她的母亲肾上腺机能不全。