It 's especially common among the khoisan in southern africa and tribes in the andaman islands .
这在南非的科伊桑人和安达曼群岛的部落中尤为常见。
Many scientists consider the khoisan a distinct race of very ancient origin .
许多科学家认为科瓦桑族是一支独特的民族，渊源非常久远。
The skin-color difference between the khoisan and bantu speakers such as the zulu indicates that the length of time that a group has inhabited a particular region is important in understanding why they have the color they do .
Under apartheid , there were just two official languages , english and afrikaans , a variant of dutch with a dash of french , german , khoisan ( spoken by so-called bushmen and hottentots ) , malay and portuguese .
