The phrase "already been underlined" is correct and usable in written English.
It can be used to indicate that something has previously been emphasized or marked in a text.
Example: "The important points in the document have already been underlined for your convenience."
Alternatives: "previously highlighted" or "marked earlier".
That has already been underlined by the dispatch of the Northern Ireland veteran George Mitchell, his special Middle East envoy, for his first talks in the region.
As has already been underlined, an important innovation in wildlife trafficking can be attributed to the new actors that have entered the market as traders, especially young collectors.
We believe that the prognosis of an isolated medial subtalar dislocation basically relies on three parameters: (1) immediate reduction (the necessity of which has already been underlined), (2) the amount of energy absorbed by the soft tissues at the moment of the violent impact, and (3) the period of postreduction immobilization.
Exon exchange using double trans-splicing at both sides of the targeted exon has never been achieved but its interest has already been underlined [16] [18].
Evaluation of rapid tests for diagnosis of recent HIV infection in healthcare settings is hindered by the difficulty of recruiting such patients, but the lack of rapid test sensitivity in this setting has already been underlined.
However, the necessity for collaboration between basic researchers and clinicians has already been underlined.
Presenting an alternative to the classical Frankenstein cliché, this image is mainly used in the media when portraying synthetic biologists, as has already briefly been underlined above.
It must have been underlined.
The latter is already clear, the former is yet to be underlined.
This seems to be underlined by the fact that some patients already received prescriptions of antidementia drugs before their incidence year [ 10].
