But then tragedy struck at 14 weeks when doctors discovered the twins umbilical cords had become tangled, cutting of each other's blood supply, causing them both to die in the womb.
但14周后，悲剧发生了。医生发现两胎儿脐带纠结在一起，于是切断了彼此的血液供给，最终导致胎死腹中。
The structure, process of work, essential of design and making of one kind of precision cutting die for two-piece on punch press were introduced. Then a practical die structure was given.
介绍了用在冲床上的一种双件精密剪切模的结构、工作过程和设计制造要点，并给出了实用的模具结构。
The structure, process of work, essential of design and making of one kind of precision cutting die for two-piece on punch press were introduced. Then a practical die structure was given.
介绍了用在冲床上的一种双件精密剪切模的结构、工作过程和设计制造要点，并给出了实用的模具结构。
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