a Gordian knot的用法和样例：
- The first day when attend class, encountered an a Gordian knot.
- But it's a Gordian knot, my dear, and it will have to be cut.
- Everybody is afraid, what a Gordian knot did golden hill interior produce?
- The deceased old man did not leave a will and the distribution of his property was a Gordian knot.
- Below such circumstance, teacher of English of rural junior high school is faced with really compare an a Gordian knot.