批准文号的英文：
registered number of approval; license number

registered是什么意思：
adj. 注册的，登记过的；已挂号的；附有血统证明的

register signal
记录器信号

bond registered
登记注册的记名债券

register of voice
嗓音声区

number是什么意思：
n. 数；号码；算数
v. 给…编号；计算，数

The number was fifty.
该数字为五十。

There is safety in numbers
人多势众

It was an irrational number.
这是一个无理数。

approval是什么意思：
n. 批准；认可；赞成

The certificate is not approved for the attempted operation.
此证书不允许您执行这个操作。

The commendation that we be evaluated was approved.
对我们进行评估的建议被批准了。

The budget was narrowly approved by congress.
国会勉强通过这项预算案。