We are considering a revision of the contract.

He worked all night to revise his thesis.

I was asked to revise this thesis.

He stayed up all night to revise the thesis.

He is working on the revision of a previously published work.

He worked all night to revise the document.

My itinerary is long distance.

He is immersed in the study of the light spectrum.

This spectrum is very beautiful.

This machine is used to divide light into a spectrum.