knotty

The technician turned over the knotty problem for a long time until he found a solution to it.
技术员把这个难题考虑了好长时间，直到想出一个解决的办法。
Reconciling and resolving gem dependencies is something of a knotty problem.
The knotty joints of his hips and shoulders stood out a good three inches from his body.
腰胯和双肩的关节瘦骨嶙峋，突出身体三英寸之多。
While a smiling request, which appeals irresistibly, does a great deal to help tackle knotty problems.
当一个微笑的请求，不可抗拒地时呼吁，非常做帮助应付难题。
He made his mind to solve the knotty problem by himself.
I mentioned knitting and nodes as well as net and knot and all of these words go back to a knotty origin.
我提到过编织（knitting）和节点（nodes），也提到过网（net）和结（knot），所有这些词汇都可以追溯到一个复杂的源头。
Puzzlement of "ask" in study--Discussion of several knotty problems in "learn to ask"
Just as a lamp can illuminate a dark room , a perceptive comment can illuminate a knotty problem .
正如灯能照亮黑暗的房间，具有真知卓见的评论亦能阐明棘手的问题。
For any company claiming the ethical high ground , decisions about advertising sales were always going to be knotty .
对于任何声称占领道德高地的公司来说，广告销售方面的决策总是相当棘手。
They met to discuss knotty problems and talk them out to a point of mutual understanding.
他们开会讨论，解决棘手的问题，从而达成相互谅解。