A systemic anaphylaxis has also been described.是什么意思？

A systemic anaphylaxis has also been described.

全身的过敏性也曾有报道.

systemic

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例句
Objective : To explore the clinical characteristics and pathogenesis of primary systemic amyloidosis.
目的: 探讨原发性系统性淀粉样变病的临床特点和发病机制.

anaphylaxis

n. 过敏反应，过敏性；

例句
A systemic anaphylaxis has also been described.
全身的过敏性也曾有报道.

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

also

adv. 也，同样，并且；conj. 另外；

例句
The media have also abetted the feeling of unreality.
媒体也在一旁对这种非现实感推波助澜。

been

v. 用来表示某人或某物即主语本身，用来表示某人或某物属于某一群体或有某种性质（ be的过去分词 ），在，存在，不受干扰，去过了，be的过去分词；

例句
Have you been able to have any kind of contact?...
你联系上了吗？

described

adj. 被看到的，被发现的；v. 描写( describe的过去式和过去分词 )，叙述，画出（图形等），形容；

例句
The President described the killings as an abominable crime...
总统称这些血案为令人发指的罪行。