Malarial poison had sallowed his skin.是什么意思？

Malarial poison had sallowed his skin.

疟疾病毒使他皮肤成灰黄色.

malarial

adj. 患疟疾的，毒气的；

例句
Standing water like this gives malarial mosquitoes the perfect place to breed.
像这样的死水给了传染疟疾的蚊子绝佳的繁殖地点.

poison

n. 毒药，酒，极糟的食物，极有害的思想（或心情等）；vt. 毒死，污染，放毒于，对…有不良影响；adj. 有毒的；

例句
Markov died after being struck by a poison dart.
马尔科夫身中毒镖而亡。

had

v. 有（ have的过去式和过去分词 ），（亲属关系中）接受，拿，买到；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

his

pron. (he的所有格)他的，(he的物主代词)他的东西；det. 属于他的，用于名词前，自己的，指某人的，上帝的；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

skin

n. 皮，皮肤，（蔬菜，水果等）外皮，毛皮；vt. 剥皮，削皮，擦破皮，擦伤，欺骗；vi. 使愈合，长皮；adj. <俚>色情的；

例句
My skin was abraded and very tender.
我擦破皮了，一碰就疼。