The first part:
We, who mystically represent the Cherubim, And sing to the Life-giving Trinity the thrice-holy hymn, Let us now lay aside all earthly cares. Amen.
After the Great Entrance:
That we may receive the King of all, Who comes invisibly upborne by the angelic hosts. Alleluia.
Though the actual text is short, the hymn lasts for quite a while due to its drawn-out, ethereal style. It is our best imitation of and supplement to the singing of the Heavenly Hosts.