The patients were asked to micturate to distend the urethra.是什么意思？

The patients were asked to micturate to distend the urethra.

采用患者自行排尿方法充盈尿道.

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

patients

n. 患者( patient的名词复数 )，接受治疗者，受动着，承受者；

例句
...a Code of Practice that would give patients right of access to their medical records.
允许病人查看自己病历的职业准则

were

be的过去时复数和第二人称单数形式，有时代替 was,用于条件从句、动词 wish 之后等；

例句
Shops, houses, and vehicles were set ablaze.
店铺、房子和车辆全都陷于火海。

asked

v. 问( ask的过去式和过去分词 )，询问，要求，请求；

例句
The defendant asked for 21 similar offences to be taken into account...
被告要求考虑到类似的21起违法行为的情况。

to

prep. 向，朝着，到，关于，属于；adv. 朝一个方向的，到某种状态，关闭；

例句
I suggest you leave it to an expert...
我建议你把它留给专家来解决。

micturate

vi. 排尿；

例句
The patients were asked to micturate to distend the urethra.
采用患者自行排尿方法充盈尿道.

distend

vt.& vi. （使）膨胀，肿胀；

例句
The abdomen distend s.
腹部胀大.

urethra

n. 尿道；

例句
The clistressed cow frequently attempts urination and pulsates the urethra over the ischial arch.
病牛频频企图排尿,坐骨弓上的尿道发生搏动.