Smoking during pregnancy increases the risk of miscarriage.

怀孕期吸烟会增加流的危险。

Results Among the reasons of haemorrhage caused by miscarriage,not entire mismarriage is the most main reason,the deformed birgh canal and extrauterine pregnancy are the next.

结果流的原因中不全流是最主要原因,其次是生殖道畸形和异位妊娠。