小圈人通常是有选择的一小伙人，他们之间经常聚会 A small, often select group of persons who associate with one another frequently.
不选择的没有进行选择的；不加选择地 Not selective; indiscriminate.
这种长期的系统变化说明自然选择的作用，并表明女性骨骼的特性较大的适应性。但是，情况完全是这样的吗？ A systematic long-term change of this kind suggests the action of natural selection and indicates that female skeletal characteristics confer greater fitness. But is this the whole story.
