membranous part的用法和樣例：
例句
- Active continence is achieved by voluntary contraction of the levator ani musculature, which surrounds the apex of the prostate and membranous urethra.
前列腺尖部和膜部周?chē)奶岣丶〉闹鲃?dòng)收縮可以導致主動(dòng)性控尿。 - The external sphincter, at the leel of the membranous urethra, is often depicted as a "sandwich" of muscles in the horizontal plane.
外括約肌，位于尿道膜部水平，常被描述為水平平面上的三明治樣肌肉。
