1. He has a singular interest in science.
    他对科学特别有兴趣。

2. “Presently you will see a paper of singular importance for which several men and women have risked their lives.
    "你很快就会见到一份特别重要的文件，那是几个人冒着生命危险换来的。

3. If today I use a singular personal pronoun to refer to myself, next week I will use the plural form.
    如果今天我提到自己时使用的是单数人称代词，那么下星期我就会使用复数形式。