retard meaning in English
vt.
弄慢，延缓，延迟，使停滞，推迟；使耽误，妨碍，阻止；【物、工】减速。 Lack of science and education retards social progress. 缺乏科学和教育会妨碍社会进步。
vi.
(潮水涨退等)迟延；耽误；迟到。
n.
迟延，迟滞，耽误；妨碍，阻止。 in retard 迟延，耽搁，阻碍。 keep at retard 使迟延，耽误，阻碍，妨碍发达[进步]。
Examples
- Larvas become retarded in the mucus .
幼虫被阻留在粘膜内。 - Small molecules are retarded from leaving the column .
小的分子被阻滞在层折柱上。 - A retarded child needs help , not pity .
智力迟钝的孩子需要的不是怜悯，而是帮助。 - A serologic reaction retards the growth of the pollen tube .
血清反应阻止花粉管生长。 - Lack of science and education retards social progress .
缺乏科学和教育会妨碍社会进步。