come hell or high wateradvadverb: Describes a verb, adjective, adverb, or clause--for example, "come quickly," "very rare," "happening now," "fall down."
(whatever the difficulties)
无论遇见什么困难 wú lùn yù jiàn shén me kùn nán
不论上刀山下火海 bú lùn shàng dāo shān xià huǒ hǎi
Come hell or high water, I am going to finish this marathon.