lucid

形容词 lucid:

1. (of language) transparently clear; easily understandable
   同义词：limpid, luculent, pellucid, crystal clear, perspicuous
2. having a clear mind
3. capable of thinking and expressing yourself in a clear and consistent manner
   同义词：coherent, logical
4. transmitting light; able to be seen through with clarity
   同义词：crystalline, crystal clear, limpid, pellucid, transparent

1. She's delirious, but has lucid intervals.
   她神志昏乱，但时而清醒。
2. The style is lucid and lively.
   笔调很明快。
3. His style is very lucid.
   他的文风简单明了。
4. I made a lucid explanation to them.
   我向他们做了明白的解释。

lu.cid

adj.（形容词）
Easily understood; intelligible.
浅显易懂的：容易被理解的，可理解的
Mentally sound; sane or rational.
明理的：精神上健康的，明智的或理性的
Translucent or transparent.See Synonyms at clear
透光的：透光的或透明的参见 clear

来源：
Latin lôcidus
拉丁语 lôcidus
from lôcôre [to shine] * see leuk-
源自 lôcôre [闪烁] *参见 leuk-

【引伸】
lucid.ity 或
lu.cidness
n.（名词）
lu.cidly
adv.（副词）