Ultrasound 's potential as a male contraceptive was first reported nearly 40 years ago .
超声波作为一个潜在的男性避孕药几乎40年前就有过报道。
Today , more than 70 million women around the world use this oral contraceptive .
如今，全球有超过七千万妇女使用这种口服避孕药。
The fertility fall was continuous . And contraceptive use spread rapidly .
生育率的降低是持续的，避孕措施的使用也迅速传开。
Controversy : the contraceptive implant nexplanon is 4cm long and is inserted under the skin .
问题的焦点：植入的避孕药是依托孕烯植埋剂，长4厘米，是植入在皮下的。
Scientists say caffeine stays in the body longer in females taking an oral contraceptive , pregnant women , young children and people with liver disease .
