右旋的软体动物的螺形外壳上的螺线顺时针螺旋即顶点向上，面对观察者时，螺线向。

Of or relating to a gastropod shell that coils clockwise and has its aperture to the right when facing the observer with the apex upward.

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右旋的软体动物的螺形外壳上的螺线顺时针螺旋即顶点向上，面对观察者时，螺线向。

Of or relating to a gastropod shell that coils clockwise and has its aperture to the right when facing the observer with the apex upward.

youdao