Health encyclopaedia - Alphabetical Topic List健康百科全书-按字母顺序排列的主题清单
| | A | | 1 | | | B | | b | | | C | | 人才招聘 | | | D | | | | | E | | 电子 | | | F | | f | | | G | | 克 | | | H | | h | | | I | | 我 | | | J | | j | | | K | | k | | | L | | 升 | | | M | | 米 | |
| | N | | n | | | O | | o | | | P | | p | | | Q | |常见问题 | | | R | | 研究 | | | S | | | | | T | | 吨 | | | U | | u | | | V | | v | | | W | | 瓦特 | | | X | | x | | | Y | | y | |
How does it work?它如何工作？ of Intrauterine system宫内系统
An IUS works by releasing the female hormone progestogen into the body, which thickens the mucus from the cervix, making it difficult for sperm to reach the egg.一学生联合会工程释放雌激素progestogen融入机构，增厚的粘液由子宫颈，使精子难以达到鸡蛋。
Progestogen also thins the womb lining making it harder for the womb to accept a fertilised egg. Some women stop ovulating (when the ovary releases an egg) completely. progestogen也thins子宫内层让我们更难为子宫接受一个受精卵，有些妇女停止排卵（卵巢时，发布一个鸡蛋）完全。
