"Pertahanan mereka diperlemah penyakit itu."

Translation: Their defense is weakened by that disease.

[DiegoJaviUnlam]

I have used the translation "Their defense is weakened by the disease.", and it was rejected. I have made a report to be added.

[IamJacksSpleen]

So can pertahanan also refer to the immune system?

[widiwkr]

Yes it actually can

[donny309620]

Shouldn't the word "oleh" needed between "diperlemah" and "penyakit"? -> "Pertahanan mereka diperlemah /oleh/ penyakit itu". If not, why not?

[LarsXensen]

I believe it can be, but is optional.

[TJR696322]

This would be a better translation: Pertahanan mereka diperlemah oleh penyakit itu.

[JimCraney]

I have used the word "Sickness", for "Disease", why is this marked wrong?