1. Frankfurt's importance is so crucial that Mercedes has a permanent building on the grounds and BMW erects its own every show.
2. The nautilus erects barriers inside its shell as it grows, leaving unoccupied chambers behind.
3. A man erects an advertisement for an upcoming housing project on the outskirts of Shanghai.
4. The town erects barriers and hangs tarps to block activists from photographing the kill, and daily hunts can be canceled if foreigners are seen in town.