His rage and frustration 'expressed' [='showed, manifested'] 'themselves' as/in/through temper tantrums.
Her love of nature is 'expressed' [='shown, reflected'] in her paintings/music.
a room where nursing mothers can 'express' [='pump'] milk for their babies
(..) "Many now go to the city of the dead, to a woman who has proven herself as true as gold..." "But the mediator must appear..." "Whatever happens tonight: it is my express order to let the workers do as they will..." "Joh Fredersen wants to let those in the depths use force and do wrong, (..)1927 Metropolis