蜗牛壳呈螺旋形。
然而，一些卵壳中会出现反向螺旋的蜗牛，多数情况下是在左旋卵壳中，右旋的出生率惊人地高。
However, some broods possess a few snails of the opposing hand, and in predominantly sinistral broods, the incidence of dextrality is surprisingly high.
大多数螺旋形的蜗牛主要是右旋的。
还好，最近一项对蜗牛壳螺旋线的研究也许能给这个谜题带来一线光明。
Recent research, though, into the way a snail's shell spirals may throw new light on this puzzle.
蜗牛的外壳形状是螺旋形的。
渐渐的，出现了凌乱的折线、曲线和像蜗牛一样的螺旋线等等，多么神奇！
Gradually, the curve line, messy and like a snail Helix and so on, what magic!
然而现在已经变为右旋占多数的蜗牛种类，其旋向性（壳的螺旋方向）一度也曾均衡分布，在某些种类中，甚至左旋曾占优势。 。
Butt at one time, handedness (twist direction of the shell) was equally distributed within some snail species that have become predominantly dextral or, in a few species, predominantly sinistral.
蜗牛：腹足科众多水生或陆栖软体动物中的一种，通常带有一螺旋似的厚壳，足宽且向内旋，脑袋清晰。
Any of numerous aquatic or terrestrial mollusks of the class Gastropoda, typically having a spirally coiled shell, broad retractile foot, and distinct head.
蜗牛壳是螺旋形的。
观察过蜗牛之后，认识其家是个螺旋状的壳，然后以简单线条画出大小不同的蜗牛。
Observe the snail and their special 'home'. Then use simple lines to draw some snails.
今天的这个是我在英国南部威尔特郡的白垩山丘捡到的一个深蓝色的蜗牛壳，上面有呈螺旋状的，淡青色和紫色交叠着的花纹。
Today's is a dark blue snail-shell, spiralled and chequered with paler blue and purple, picked up somewhere on the Downs.
今天的这个是我在英国南部威尔特郡的白垩山丘捡到的一个深蓝色的蜗牛壳，上面有呈螺旋状的，淡青色和紫色交叠着的花纹。
Today's is a dark blue snail-shell, spiralled and chequered with paler blue and purple, picked up somewhere on the Downs.
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