"I presume that primates 'brains develop in the womb over a relatively longer period of time, and the structure of their brains is more complex and therefore capable of constructing screening mechanisms in the bloodstream. Physically harmful elements are not allowed to pass from the blood into the brain," explains Dr. Tung Ta-cheng.
「推測是因靈長類在胎內形成大腦的時間較長，腦的構造較複雜，能形成血液的『障壁』，不讓血液中對人體有害的物質通過所致」，董大成解釋。