在 + 莫斯科
The noun 莫斯科 (Mòsīkē) is the Chinese transliteration of "Moscow," the capital city of Russia. It is a proper noun used in geographical, political, and cultural contexts when referring to the Russian capital.
我下个月要去莫斯科出差。
Wǒ xià gè yuè yào qù Mòsīkē chūchāi.
I'm going to Moscow on a business trip next month.
莫斯科的冬天特别冷,经常下大雪。
Mòsīkē de dōngtiān tèbié lěng, jīngcháng xià dà xuě.
The winter in Moscow is especially cold, and it often snows heavily.
他在莫斯科留学了三年,俄语说得很好。
Tā zài Mòsīkē liúxué le sān nián, Éyǔ shuō de hěn hǎo.
He studied abroad in Moscow for three years and speaks Russian very well.