语境线索
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”