1. Was he related to anyone of importance?
    他跟什么要人有关系吗？

2. The importance of washing one''s hands before a meal is that it prevents infection.
    饭前洗手的重要性在于防止传染。

3. Here I would stress the importance of mathematics to the whole of science.
    这里我要强调数学对整个科学的重要性。

1. 重要;重大;重要性
    The importance of something is its quality of being significant, valued, or necessary in a particular situation.

importance

    e.g. We have always stressed the importance of economic reform...
           我们一向强调经济改革的重要性。
    e.g. Safety is of paramount importance.
           安全第一。

2. 重要地位;名望
    Importance means having influence, power, or status.

1. the quality of being important and worthy of note

    e.g. the importance of a well-balanced diet

2. a prominent status

    e.g. a person of importance

    Synonym: grandness