Ovulation refers to the time during a woman’s menstrual cycle when eggs are released from the ovaries to the fallopian tubes. It is generally considered to be a critical time period during a woman’s reproductive period. Although the exact time of ovulation varies from person to person, it usually lasts about 10 days in most people's cycles.

In addition to understanding the importance of ovulation for family planning, couples should also know how to determine their own ovulation. Generally speaking, it can be judged by the following methods:

1. Observe symptoms: Some women will experience symptoms such as decreased appetite and high energy during ovulation. These phenomena may indicate that they are already ovulating.

2. Measure body temperature: Women can determine their ovulation period by measuring body temperature. Generally speaking, a woman's body temperature will rise by 0.5 to 1 degree Celsius during ovulation.

3. Observe vaginal discharge: A woman's vaginal discharge usually increases during ovulation and becomes softer in texture, which may indicate that the egg is waiting for sperm to arrive.

To sum up, understanding the ovulation period is very important for family planning. Couples can judge their ovulation period by observing symptoms, measuring body temperature and observing vaginal secretions, and perform ML at the appropriate time.