“在任何情况下”用英语怎么说啊

看你用在什么场合了，以下几个短语都可以作为“在任何情况下、无论如何”的意思：
through fair through fair
under any circumstances
foul and fair
through thick and thin
on your life
in any term

under/in any circumstances

要看整个句子。
in any case比较常用
in / under any circumstances 较正式