What does the 'speak' mean in the following sentence?
The solvent attracts the CO2 molecules from the exhaust gas and then we take the chemical with the CO2 molecules and boil the CO2 so to speak, so that we can separate the CO2 from the solvent that we used and we use the solvent again to capture more CO2.

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so to speak = this is one way to say it; it indicates that the phrase is not to be understood literally

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so to speak 我查了一下是 [也就是说，可以说是] 的意思，前面应该有逗号，但是后面为什么还有so

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