Yes, plural
复数───complex;是───yes
Now, the next point is quite complex.───请注意,下一点非常复杂。
If a book is hard going, it ought to be good. If it posits a complex moral situation, it ought to be even better.───如果一本书很难读, 那么它应该是一本好书; 如果它提出了一个复杂的道德状况, 那么它就更应该是本好书了.
Ritter was a very complex man but Marius was the opposite, a simple farmer.───里特城府颇深,而马里厄斯恰恰相反,是个心地淳朴的农民。
I have never had a complex about my height.───我从来没有担心过自己的身高。
Douglas was a complex man, thoughtful, gallant, and generous.───道格拉斯让人捉摸不透,他体贴周到,对女孩子颇为殷勤,而且慷慨大方。
What he said was too complex for me to understand.───他说的太复杂了,我无法了解.
This is a complex of new building.───这是新建筑群.
His complex anger flamed afresh , and Ruth was in terror of him.───他的无名火又冒上来了, 罗丝见他真害怕.