1. singular matrix
   奇异矩阵，退化矩阵，降秩矩阵
   

1. This thicket was a singular—an exceedingly singular one.
   这片林子很怪——怪得出奇。
2. The old man who lived alone had singular table manners.
   那个独身生活的老人有一种奇怪的就餐规矩。
3. He has a singular interest in science.
   他对科学特别有兴趣。
4. Give the singular forms of the following nouns.
   写出下列名词的单数形式。
5. A second person singular present indicative of be.
   be的第二人称单数现在陈述语气动词。

　1个名词解释

　6个形容词解释