求翻译：This ratio is sexual ly dimorphic; the tendency of men to hav e a longer fourth digit compa red to the second digit (lower 2D: 4D rati o) has been described in several populations. The ratio does not change at puberty and is probably determined during prenatal differentiation of the digit sas bone-to-bone ratios in the是什么意思？

待解决 悬赏分：1 - 离问题结束还有