Admission is obtained by written application.是什么意思？

Admission is obtained by written application.

要求录取须书面提出申请。

admission

n. 准许进入，承认，坦白，入场费；

例句
Students apply for admission to a particular college...
学生们申请上某所大学。

is

vt.& vi. 是（be的三单形式；n. 存在；

例句
Bollinger 'RD' is a rare, highly prized wine.
博林格RD香槟是一种名贵的备受推崇的葡萄酒。

obtained

v. 获得( obtain的过去式和过去分词 )，买到，（规则、制度、习俗等）存在，流

例句
I had obtained the authentic details about the birth of the organization.
我已经掌握了有关该组织诞生的可靠的详细资料。

by

prep. 在…旁边，表示方式，由于，经过；adv. 经过，表示保留或保存时用，短暂拜访；

例句
...expensive make-up that we saw being advertised by a beautiful model...
我们所见的由一位漂亮模特代言的昂贵化妆品

written

adj. 书面的，写成文字的，明显受到…影响，（感情）全挂在脸上；v. 写( write的过去分词)，写信；

例句
...a written declaration by someone, authorizing another person to act as his agent.
一份某人授权他人为其代理人的书面申明

application

n. 适用，应用，运用，申请，请求，申请表格，勤勉，用功，敷用，敷用药；

例句
His application for membership of the organisation was rejected...
他想要加入该组织的申请遭到了拒绝。