Retardation

(noun.) lack of normal development of intellectual capacities.

(noun.) the extent to which something is delayed or held back.

录入:尼科尔

• There is another possible mode of transition, namely, through the acceleration or retardation of the period of reproduction. 查尔斯·达尔文. 物种起源.
• Adams between Baltimore and Washington, demonstrated that by sheathing the train to prevent retardation by the air, an average speed of 78. Edward W. Byrn. 十九世纪发明进展.

整理:洛厄尔