In grade III, urine fills and begins to stretch both the ureter and the renal pelvis.

液充盈开始导致管和肾盂扩张。

Urine collects in the renal pelvis and then heads out of the kidney through the ureter.

液在肾盂中聚集，然后通管排出肾脏。

The renal papilla project into minor calyces which join together to form major calyces which funnel into the renal pelvis.

肾乳头突入肾小盏，2-3个肾小盏合成肾大盏；2-3个肾大盏合并成漏肾盂。

In grade II, urine fills the entire ureter and the renal pelvis, the center part of the kidney.

液充满整个管和肾盂，即肾中心部分。

Once millions of nephrons have each made urine, it flows into the minor calyces, then major calyces, and finally into the renal pelvis.

当数以百万计肾单位各自都产生液，液便流入肾小盏，然后是肾大盏，最终进入肾盂。

There are three major regions of the kidney, cortex, medulla and the renal pelvis.

皮质、髓质和肾盂。外层颗粒状层是肾皮质。

In grade IV, the ureter is so swollen that it begins to get curvy and the renal pelvis and calyces—the urine collection ducts—become moderately swollen and distorted.

管于肿胀，甚至开始产生卷曲，肾盂、肾盏和集合管发生中度肿胀和扭曲。

And finally, the innermost layer is the renal pelvis, a funnel-shaped tube surrounded by smooth muscle that uses peristalsis to move urine out of the kidney, into the ureter, and into the bladder.

最后，最内层是肾盂，一个被平滑肌包围漏状管，利用蠕动将液从肾脏移出，进入管，进入膀胱。