求翻译：由于海胆是呈球状及旋转对称的，与其他生物相似，海胆在胚胎阶段都是呈球状及旋转对称的，但是很奇怪的是海胆在其幼年阶段却不是这样的。长腕幼虫只是反射对称的在成长阶段，海胆须由原本的旋转对称转变为反射对称，并由反射对称再次转变为旋转对称是什么意思？

Sea urchins are spherical and rotational symmetry, similar to other organisms, sea urchins in the embryonic stage are spherical and rotational symmetry, but the strange thing is that the sea urchin in its juvenile stage is not the case. Larvae of the long wrist just the reflection symmetry in the gr

The Sea Urchin is a ball and rotation symmetric and similar to other creatures, sea urchins are in embryonic stages and rotate a spherical symmetry, but it was strange that sea urchins in its earliest stages, it is not the case. Larvae are long wrist strap of the reflection symmetry in the growth ph

Because the sea urchin assumes spherical and the rotational symmetry, is similar with other living thing, the sea urchin all assumes spherical and the rotational symmetry in the embryo stage, but very what is strange the sea urchin in its childhood stage actually is not such.The long wrist larva onl

Because of the Sea Urchin is spherical and rotationally symmetric, and other creatures similar to stages of sea urchin embryos are spherical and rotation symmetry, but it is very strange that sea urchin in its infant stage, it is not the case. Pluteus is during the growth phase of reflection symmetr

正在翻译，请等待...