No one knows why a fetus is not automatically rejected by the mother’s immune system.没有人知道为什么母亲的免疫系统不会自动排斥胎儿。Modern medical technology like type-B ultrasonic checks can reveal the fetus gender.现在的医疗仪器例如B超是可以分辨出胎儿的性别的。Gro...
He squirmed out of the straps of his backpack.他扭动身体，挣开背包的肩带。He was almost strangled by his parachute harness straps.他差点被自己的降落伞吊带勒死。Brian pulled the straps through the buckles of his suitcase.布赖恩将带子穿过自己手提箱的带扣。...