UK、US区别也不一定就是UK更新吧，或许都是我们瞎猜呢
复制一堆废话：
What is the difference between the US English and UK English versions of the site?
The US version follows US English writing and spelling conventions, and features content tailored for countries that follow US English conventions. The UK English version of the site is based on British English writing and spelling conventions.
The UK English version of the site uses The Oxford Dictionary of English and Oxford Thesaurus of English and the US English version of the site uses the New Oxford American Dictionary and the Oxford American Writers’ Thesaurus.
Both English versions of the site, however, feature exceptional coverage of English around the world, including British, Australian, Scottish, Irish, Indian, South African, US, and Canadian English – with each regional usage clearly labelled.