These remarkable images of animals in the womb were produced using a combination of 4D ultrasound scans, purpose-built models and computer technology, for a new TV documentary.

• 以下这组非常罕见的子宫中动物宝宝的照片是用4D超声波扫描结合计算机技术做出的，它们是一部电视纪录片的组成部分。