Formal:
* 欢迎来到伦敦 (Huānyíng lái dào Lún Dūn) - This is the most literal and formal translation. It translates to "Welcome to London."
* 欢迎您来到伦敦 (Huānyíng nín lái dào Lún Dūn) - This is a more polite version of the above, using "您 (nín)" which is a polite form of "you."
Informal:
* 伦敦欢迎你 (Lún Dūn huānyíng nǐ) - This translates to "London welcomes you."
* 欢迎来伦敦玩 (Huānyíng lái Lún Dūn wán) - This translates to "Welcome to London to play," implying the person is coming for leisure.
Note:
* Mandarin pronunciation can be challenging for non-native speakers, so you can use a pronunciation tool like Google Translate or Forvo to hear the correct pronunciation.
* The tone marks are important for pronunciation in Mandarin.
* It's always a good idea to practice saying the phrase before you use it.
No matter which phrase you choose, it's sure to be appreciated by your London-bound friends!