YOU SAID:
The chinese invented gunpowder.
INTO JAPANESE
中国では、火薬を発明しました。
BACK INTO ENGLISH
In China invented gunpowder.
INTO JAPANESE
中国で火薬を発明しました。
BACK INTO ENGLISH
Gunpowder was invented in China.
INTO JAPANESE
火薬は中国で発明されました。
BACK INTO ENGLISH
Gunpowder was invented in China.
That didn't even make that much sense in English.