Please translate this part into English. 近年来,随着经济的快速增长,中国的国际影响力提升了,世界上学汉字的人也多了起来。这套独特的符号系统,积淀了丰富的历史文化内容,西方人在学汉字的过程中,甚至能体会到这个东方民族微妙心灵。如今在中国,汉字也越来越受到人们的重视。人们发现,这一文字符号,包含着丰富的文化内涵和审美意蕴,在科技飞速发展的今天,反而越来越显示出它的光彩。古老的文字,在现代的文化生活中焕发了新的魅力。
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举一反三
【单选题】Which of the following is not a basic requirement of a relational database?
A.
Every column in a row must be single valued.
B.
Primary keys cannot be null.
C.
Foreign keys, if not null, must have values that correspond to the value of another foreign key in another table.
D.
All nonkey attributes in a table should describe a characteristic about the object identified by the primary key.
E.
All of the above are basic requirements of a relational database.