英语翻译:到时候欢迎你来到北京

Welcome to Beijing by then!!

by then 含有非常强烈的表达出“到时候”的意思。
而简单用then ,则会有“那时候，”，“那时”，“然而”等意思！！！

Welcome to Beijing by then!!

When the time comes welcome you to come to Beijing

Welcome you at that time arriving in Beijing

When the time comes welcome you to come to Beijing.

到时候欢迎你来到北京
When the time comes welcome you to come to Beijing.