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to expatiate
Estoy seguro que eres consciente, no es necesario explayarse.
But I'm sure you're aware of this, no need for me to expatiate.
Una teoría interesante, señor. ¿Le importaría explayarse sobre eso?
An interesting theory, sir. Would you care to expatiate upon it?
A menudo te has explayado sobre la buena química con la que hemos trabajado juntos.
You've often expatiated on the thorough good feeling with which we've worked together.