1)狭义语境线索
在一个句子范围内，该词语前后的语言单位(该词语所属的语法结构).
1. The house was surprisingly sound, though it was more than two hundred years old.
2. These people are mentally sound, but physically handicapped.
3. Industrial expansion is a very sound investment in present society.
4. In the end, the enemy force suffered a sound defeat and soon withdrew from the front.
5. I believe that it's sound for boys and girls to have basically the same education.
6. Fortunately, my wife was safe and sound after her ordeal.
2)广义语境线索
超越一个句子范围，它可以是句群、段落、章节甚至整篇文章。
A statesman is a wise, experienced and respected political leader.
"Mothers may still want their favorite sons to grow up to be President, but . . . they do not want them to become politicians in the process"
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