"barrier method"的定义和意义

What is the "barrier method"?

The barrier method is a type of birth control that prevents pregnancy by creating a physical barrier to keep sperm from reaching the egg. Common barrier methods include condoms, which are worn on the penis to catch sperm; diaphragms, which are flexible devices placed inside the vagina to cover the cervix; and cervical caps, which are similar but smaller devices that fit over the cervix. These methods help to reduce the chance of pregnancy and also protect against sexually transmitted infections (STIs).