很久以前,在大沙漠中唯一的交通工具就是骆驼。古埃及商人们靠它驮着沉重货物,长途跋涉。但母骆驼在途中经常由于怀孕而耽误运输。于是,聪明的商人们想出一个法子:把一些圆滑的石子,放进母骆驼的子宫腔内,这样一来就不会怀孕了。这就是“宫内节育器”的雏形。 Long ago, the only means of transportation in the desert was a camel. Ancient Egyptian merchants rely on it carrying heavy cargo, long journey. However, female camels are often delayed on their way to transport due to pregnancy. So smart businessmen come up with a way: put some sleek stones into the uterine cavity of the mother camel, so that they will not be pregnant. This is the “IUD” prototype.