这就是当一个胎儿死亡后，双胎的另一个体死亡率会高达60%的原因。

This is why, when one fetus dies, the risk of death for the co-twin can be as high as 60%.

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养护时首先应查看轮胎气压、磨损状况，螺母有无松动或掉落，除去双胎间或胎面上的嵌入物及铁钉等尖利杂物。

Maintenance should first check the tire pressure, wear, nut loose or fall off, remove the twins or tread on the inserts and nails and other sharp objects.

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一个新的模型可以帮助解决这个难题，即评估接受IVF治疗的患者的双胎妊娠的概率。

A new model could help solve the dilemma by weighing each woman's probability of having twins against the likelihood of conceiving through IVF.

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