delay: usually implies a putting off (as a beginning or departure): a tight schedule means we cannot ~ any longer.


procrasinate: implies blameworthy delay esp. through laziness, hesitation or apathy: ~ about making every decision.


lag: implies failure to maintain a speed or rate set by others: we ~ behind other countries in shoe production.


loiter: implies delay while in progress, esp. in walking: ~ at several store windows before going to church.


dawdle: MORE clearly suggests idleness, aimlessness,and a warndering mind: children ~ing on their way home from school.


dally: suggests delay through trifling and vacillation when promptness is necessary: stop ~ing and get to work.


delay: 泛指拖后延迟 (如开始、出发等)，procrasinate: 应受指责的拖延，由于懒惰犹豫漠视， lag:没有跟上他人的速度指标(rate泛指指标)，loiter: 行动的过程中(这里progress表示行动不是进步)拖延，特别是行走时，dawdle: 更明确的表达空闲漫游无目的，dally:表示在需要快速的时候，磨蹭(trifle: 注意力不集中)或犹豫(vaccilate犹豫: 摇摆反复)。

记忆方法:  1）首字母联想PD LDLD浦东溜达溜达<==拖延了时间


         2）拖延的意思是出发或行动缓慢，导致落后 mean to move or act slowly so as to fall behind.