The ulcer has perforated into the lessor omental bursa.是什么意思？

The ulcer has perforated into the lessor omental bursa.

溃疡穿透到小网膜囊.

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。

ulcer

n. <医>溃疡，腐烂物，道德败坏；

例句
The ulcer had been troubling her for several years.
溃疡已经折磨她好几年了。

has

v. 有( have的第三人称单数 )，（亲属关系中）接受，拿，买到；

例句
...the operation a patient has had.
病人做过的手术

perforated

v. 穿孔于，在…上打眼( perforate的过去式和过去分词 )，（在纸张等上）打齿孔[孔眼线]；

例句
The ulcer has perforated into the lessor omental bursa.
溃疡穿透到小网膜囊.

into

prep. （表示方向）进入…中，（表示所属）输入，（表示状态）进入…状态，（表示时间）持续到；

例句
By 1838, the abolitionists had shamed parliament into ending slavery in British colonies...
到1838年，废奴主义者迫使议会出于道德压力而废除了英国殖民地的奴隶制。

lessor

债主；

例句
The ulcer has perforated into the lessor omental bursa.
溃疡穿透到小网膜囊.

omental

--

例句
The ulcer has perforated into the lessor omental bursa.
溃疡穿透到小网膜囊.

bursa

n. 囊，粘液囊；

例句
Sufferred from disease of pig bursa cercaria to there are those symptoms?
患了猪囊尾蚴病有那些症状?