The internal urethral sphincter automatically and involuntarily opens, and the urine is released.

尿括约肌自然而然的张，尿就排出来了。

Simultaneously, the internal urethral sphincter opens. This is called the micturition reflex.

同时，括约肌始打。这叫做排尿反射。

Whooshing downwards, the fluid enters the urethra and stops short at the external urethral sphincter.

液体飞速的向下流进尿，胱经尿排出体外。

In men and women, around the internal urethral orifice, the detrusor muscle thickens to form the internal sphincter.

无论男女，尿口的逼尿肌增厚，形成尿括约肌。

Simultaneously, the internal urethral sphincter opens.

同时，尿括约肌打。

The urethra is a thin muscular tube that drains urine from the bladder, starting from the internal urethral orifice to the external opening.

尿是细的肌管，胱引流尿液；起于尿口，终于尿外口。

The brain can counter it if it's not a good time to urinate by sending another signal to contract the external urethral sphincter.

通过发射另一个信号来控制尿外括约肌大脑会判断现在是不是排尿的合适时机。

The external urethral sphincter is one of the muscles of the pelvic floor, and it provides support to the urethra and bladder neck.

尿外括约肌是一种盆底肌，它向尿和胱颈提供支撑。

The urethral sphincter is a collective name for the muscles used to control the flow of urine from the urinary bladder.

尿括约肌是用来控制尿液胱流出的肌肉的总称。

But under normal circumstances, your decision to urinate stops the brain's signal to the external urethral sphincter, causing it to relax and the bladder to empty.

但是在正常情况下，你要排尿的决定阻止了大脑向尿外括约肌发出信号使得它始放松，胱排空。

The original group examined by the researchers was made up entirely of people with prostate or urethral gland cancer, and included only one woman among 100 subjects.

研究人员检查的原始组完全由前列腺癌或尿腺癌患者组成， 并且在 100 名受试者中仅包括一名女。

The floor of the bladder has a smooth triangular region called the trigone region - with two corners at the ureterovesical junctions and the third corner being the internal urethral orifice, where the bladder meets the urethra.

胱的底部有一个光滑的三角形区域，称为胱三角；其中两角顶端为输尿管-胱连接处，第三角定点为尿口；胱与尿通过尿口相通。