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
(..) we need to find Luke. But we don't know where he is. I know someone who does. Come on. What, are we shipping ourselves overnight express to the Sea of Monsters? You want to find Luke? His dad will know where he is. Olympic Parcel Service. Come on. Like it? He'll love it. (..)2013 Percy Jackson: Sea of Monsters
(..) who only care about themselves. We need to find a bus station. First we need to get some money. Hey, there, valued half-blood account holder! Sign up for our new Aphrodite Express credit card, and you can... Can I get four venti half-caf no-whip lattes? And an extra shot of nectar. Nectar? (..)2013 Percy Jackson: Sea of Monsters