知識(shí)貝殼
知識(shí)貝殼
所屬欄目：英漢雙解生物學(xué)
1. The reflex process inthe eye by which an image is focused on theretina. In humans,the eye at rest is focusedon infinity,with the lens and cornea flat-tened,To focus on a near object the ciliarymuscles contract,and the lens,being elas-tic,becomes more c ......（本文共 894 字 ） [閱讀本文] >>