... testify to 说明，证实 thank for感谢 that is（=i. e.） 就是说，即 ...
2
?为感谢
感谢上帝 Gott sei Dank ; Thank God ; But Thanks Be God ; Thank God I'm a Country Boy 为感谢thank for 表达感谢 express gratitude ; ExpressingThanks ; Thanks and Gratitude ..
3
?感激
... get over 战胜，解决(问题等)；(从疾病、扫兴等)中恢复过来 thank for感激 put off 推迟，推延；禁止，劝阻 ...
4
?为
... wait for 等候 thank for为 感谢 apologize to sb. for sth. 为某事向某人道歉 ...