slowly but surely [ˈsləʊliadv bʌt ˈʃʊəli:]

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稳步地；坚定不移地

My hometown is slowly but surely changing.我的家乡正缓慢却实实在在地发生着变化。
Slowly but surely the great ship glide into the water.那艘巨轮缓慢而平稳地下水了。