clearly expressed; easy to understand 表达清楚的；易懂的 a lucid style/explanation 明白易懂的风格；清楚的解释 He gave a very lucid account of the events. 他对事件做了非常清晰的描述。
able to think clearly, especially during or after a period of mental illness （尤指生病期间或病愈后，糊涂状态中或过后）头脑清晰的，清醒的
Word Originlate 16th cent. (originally meaning bright or luminous): from Latin lucidus (perhaps via French lucide or Italian lucido) from lucere ‘shine’, from lux, luc- ‘light’.