They are already battling to eradicate illnesses such as malaria and tetanus...是什么意思？

They are already battling to eradicate illnesses such as malaria and tetanus...

他们已经在努力消灭疟疾、破伤风等疾病。

they

pron. 他/她/它们，人们，大家，政府，当局，她们；

例句
The storms had abated by the time they rounded Cape Horn.
他们绕过合恩角时，暴风雨已经减弱。

are

vi. （用于第二人称单复数现在时，第一、三人称复数现在时）是；n. 公亩（等于100平方米）；

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。

already

adv. 早已，已经，先前；

例句
He has already voted by absentee ballot...
他已进行了缺席投票。

battling

v. 与[对]…作战，争斗( battle的现在分词 )；

例句
...a lone yachtsman returning from his months of battling with the elements...
只身驾驶游艇与恶劣天气搏斗数月后成功归航的人

to

prep. 向，朝着，到，关于，属于；adv. 朝一个方向的，到某种状态，关闭；

例句
I suggest you leave it to an expert...
我建议你把它留给专家来解决。

eradicate

vt. 摧毁，完全根除；n. 根除者，褪色灵；

例句
They are already battling to eradicate illnesses such as malaria and tetanus...
他们已经在努力消灭疟疾、破伤风等疾病。

illnesses

n. （身体或精神上的）疾病( illness的名词复数 )，（某种）病，患病期；

例句
They are already battling to eradicate illnesses such as malaria and tetanus...
他们已经在努力消灭疟疾、破伤风等疾病。

such

det. 这样的，那样的，如此，这样；

例句
...abstract principles such as justice...
正义等抽象原则

as

adv. 同样地，一样地，例如；prep. 作为，以…的身份，如

例句
As far as I can recall, Patti was a Smith.
我记得帕蒂是姓史密斯的。

malaria

n. <医>疟疾，瘴气，瘴疠，痁；

例句
...diseases like malaria that have been banished for centuries.
已经被根除数世纪之久的疟疾之类的疾病

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。

tetanus

n. 破伤风；

例句
Detect the tetanus antiserum units of immunized animals by indirect hemagglutination assay.
用间接血凝实验检测免疫动物血清中的破伤风抗体单位.