中期的

Paleolithic period intermediate stage important anthropolite, has Ma Baren, the Changyang man, Ding Cunren and so on.

旧石器时代重要类化石，有马坝、长阳 、丁村等。

In the middle Eocene formations of North America occurs the more specialized Uintatherium (or Dinoceras), typifying the family Uintatheriidae.

于始新世北美洲，出现了更为专门尤因他兽，是属于犹因他兽科。

Human Peripheral blood exposed with tritiated water at variousdoses for 54 hr was examined to observe the chromosome and chromatid abe-rrations at metaphases in the first mitosis of lymphocytes.

将体外周血在不同剂量氚水培养54小时,观察到淋巴细胞有丝分裂染色体型及单体型畸变。