小圈人通常是有選擇的一小伙人，他們之間經(jīng)常聚會(huì )
A small, often select group of persons who associate with one another frequently.
不選擇的沒(méi)有進(jìn)行選擇的；不加選擇地
Not selective; indiscriminate.
這種長(cháng)期的系統變化說(shuō)明自然選擇的作用，并表明女性骨骼的特性較大的適應性。但是，情況完全是這樣的嗎？
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.
