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 | | | | H | | h | | I | | | | J | | j | | K | | k | | L | | | | M | | |
| N | | n | | O | | o | | P | | p | | Q | |常见问题 | | R | | 研究 | | S | | | | T | | | | U | | u | | V | | v | | W | | 瓦特 | | X | | x | | Y | | y |

Periods, irregular期间,不规则

Menstruation is the periodic (approximately monthly) shedding of the lining of the womb (endometrium).月经是周期(约每月一次)脱落衬砌子宫(子宫内膜) 。

Menstruation or periods start at puberty (9 to 15 years) and continue until the menopause (45 to 55 years).或月经期开始,青春期( 9至15岁)和继续进行,直至绝经期( 45至55岁) 。 The average menstrual cycle lasts 28 days, but commonly vary between 24 days and 35 days.平均月经周期历时28天,但普遍有所不同之间的24天及35天。

After puberty, most women develop a regular menstrual cycle with a relatively consistent length of time between periods.青春期后,大多数妇女建立一种定期月经周期的一个比较一致的时间长度之间的时期。 Menstrual bleeding normally lasts between 2 and 7 days, with the average length of bleeding being 5 days.月经出血,通常会持续2至7天内,平均长度正在出血5天。