Sinistral rarity might, then, be a consequence of possible disadvantages conferred by these other concomitant structural features.
因此，左撇子的稀少可能是这些其他伴随的构造特征所带来的不利影响的结果。
2
However, some broods possess a few snails of the opposing hand, and in predominantly sinistral broods, the incidence of dextrality is surprisingly high.
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。
3
In experiments, an injection of cytoplasm from dextral eggs changes the pattern of sinistral eggs, but an injection from sinistral eggs does not influence dextral eggs.