a skein of woollen yarn的用法和样例：
- When they had paid, he had caught sight of a skein of vivid red yarn in the young man's canvas bag.
- She passed me a skein of wool.
- A man was lying in the box on top of a pile of woollen goods.
- a skein of (yarn, thread, etc.); a hank of
- Lately, there has been a skein of such dangerous discoveries, one with deadly consequences.