A pustule caused by smallpox or a similar eruptive disease.是什么意思？

A pustule caused by smallpox or a similar eruptive disease.

痘疱由天花或类似的发疹性疾病导致的脓疱.

pustule

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例句
A pustule caused by smallpox or a similar eruptive disease.
痘疱由天花或类似的发疹性疾病导致的脓疱.

caused

人为的；

例句
The report has caused acute embarrassment to the government...
报告将政府置于窘境。

by

prep. 在…旁边，表示方式，由于，经过；adv. 经过，表示保留或保存时用，短暂拜访；

例句
...expensive make-up that we saw being advertised by a beautiful model...
我们所见的由一位漂亮模特代言的昂贵化妆品

smallpox

n. 天花，痘疮，痘；

例句
It was a kind of cesspit constantly seething with smallpox and bubonic plague.
那里,几乎可以说曾经是天花和黑死病生生不息的污水坑.

or

conj. 或，或者，还是，不然，否则，左右；prep. <古、诗>在…之前，比…更早；n. [纹章]黑金色、黑色；

例句
We are scared to abandon ourselves to our feelings in case we seem weak or out of control.
我们不敢放纵自己的情感，以免显得太过软弱或缺乏自制。

similar

adj. 类似的，同类的，相似的，同样的；n. 类似物，相像的人，相似物；

例句
The defendant asked for 21 similar offences to be taken into account...
被告要求考虑到类似的21起违法行为的情况。

eruptive

adj. 暴发的，喷火的，疹的；

例句
A pustule caused by smallpox or a similar eruptive disease.
痘疱由天花或类似的发疹性疾病导致的脓疱.

disease

n. 疾病，弊端，不安；vt. 传染，使…有病；

例句
In many cases the disease will clear up of its own accord.
这种病很多情况下会自愈。