1774年，日本著名医者杉田玄白翻译了荷兰人J．Kulmus所著的《解体新书》。这是日本第一部译自外文的人体解剖学书籍，“解体”也是中国医学名词的鼻祖。以《解体新书》的出版为契机，在江户时代日本的学术文化中心，形成了一个后来成为兰学（即通过荷兰传播到日本的西方学术）核心的群体。这说明（    ）

下面短文中有10处语言错误。请在有错误的地方增加、删除或修改某个单词。

增加：在缺词处加一个漏字符号（∧），并在其下面写上该加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下划一横线，并在该词下面写上修改后的词。

注意：1）每处错误及修改均仅限一词；

2）只允许修改10处，多者（从第11处起）不计分。

    I was taking a train to London's Victoria Station. I had noticed that the carriage was noise and filled with people.

    Before long, a train inspector comes to check out tickets. A passenger realized he couldn't find his ticket but became quite upset. Then everyone in the carriage began searching the ticket, which was eventually found under a seat several rows from his owner. The person who found a ticket smiled with pleasure at his success.

    No one in the carriage had previous spoken to or even noticed the ticket-owner before. Yet, they had so quickly offered the strangers their help. If we could show concern to others on need, the world would be a better place to live in.

“毒胶囊”成为社会焦点，铬严重超标。其中含有的铬酸钠（Na₂Cr₂O₇)中铬元素的化合价为（   ）