关于English and Chinese which is more useful in the world and why 用英语谈一些看法

we have to confess that English is a world wide language because we have to use it to communicate with overseas. to learn their culture, history, idea and other useful things. ....

English is wordwide used language ,and the number of people who use language as mother tongue is the largest.so i think both of the language is usefull but it depond on the field you specialized in