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said when you want to start speaking seriously about something after making jokes and laughing about it
言归正传，说正经的
Joking apart, will you be able to manage on your own?
言归正传，你自己能应付得了吗?
I know I threatened to leave and go round the world, but, joking aside, I do need a vacation.
我知道我吓唬你们过说要离开这里周游世界，但说正经的，我确实需要一个假期。