Conclusions:The high S/D values can be caused by fetal anomalies, especially multi-malformations, gastrointestinal tract and central nervoussystemmalformations.
结论：胎儿畸形，尤其是多发畸形、消化系统畸形和中枢神经系统畸形可引起S/ D值增高。
2
Inhalation of toluene can cause pregnant women infants with malformations, fetal central nervoussystem dysfunction and growth retardation and other defects.