Mediastinal lymph nodes were usually hyperemic and enlarged.是什么意思？

Mediastinal lymph nodes were usually hyperemic and enlarged.

纵隔淋巴结通常充血和增长.

lymph

n. 淋巴（液），痘苗，溪水，泉水；

例句
Bulbar conjunctiva may act as a local lymph node of Mooren's ulcer.
蚕蚀性角膜溃疡的球结膜可能起着局部淋巴结作用.

nodes

n. 节( node的名词复数 )，（计算机网络的）节点，结节，植物的节；

例句
Stem erect or floating, elongate, 5 - angled, nodes often with adventitious roots.
茎直立或漂浮, 拉长, 5具角, 节通常具不定根的.

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。

usually

adv. 通常，经常，平常，惯常地，一直，向来，动不动，一般，素；

例句
In Europe, AC is usually generated at 50 Hz.
欧洲的交流电输出频率通常为50赫兹。

hyperemic

充血的；

例句
Mediastinal lymph nodes were usually hyperemic and enlarged.
纵隔淋巴结通常充血和增长.

and

conj. 和，与，而且，于是，然后，因此；

例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

enlarged

v. 扩大( enlarge的过去式和过去分词 )，扩展，扩充，放大；

例句
An enlarged prostate does not necessarily mean cancer...
前列腺肿大不一定就是癌症。