catch up1. 追上赶上达到(某水平)
2.to do what needs to be done because you have not been able to do it until now.赶做,
补做(后跟介词to)例:I have some work to catch up on.我有些活要赶着做。
chronic 1(esp of a disease) lasting for a long time;continually recurring(尤之疾病)长期的,慢性的,
连续复发的 例:chronic arthritis 慢性关节炎/the country's chronic unemployment problem国家
的长期失业问题
2.suffering from a particular problem or type of behaviour for a long time长期患病的;
有某种习惯的 例:a chronic alcoholic醉酒成性的人。
develop1(使)成长,发展,壮大2.to begin to have sth such as a disease or a problem ;to srart to
affect sb/sth 患(病);出现(问题)(疾病)开始侵袭;(问题)开始影响。例:The car developed
engine troble.汽车发动机出故障了。
to make an idea, a story etc clearer by explaining it furture详尽描述,阐明(观点等)