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 |

What is it used for?它是什么用呢？ of Natural family planning自然计划生育

Natural family planning is used either to avoid pregnancy, or to increase the chances of becoming pregnant.  Using natural family planning methods does not provide protection against infection of sexually transmitted diseases.自然，计划生育是使用，也可以以避免怀孕，或增加的机会，成为孕妇。使用自然计划生育方法不提供保护，防止感染性传播疾病。