Introduction to Wave Lawn: The aborigines of Australia lived by gathering and hunting. In ancient times, the Australian aborigines invented a magical weapon called the "boomerang". The "boomerang" is shaped like a "V" "" font, when hunting, the hunter throws at the prey. If the target is not hit, the "boomerang" will automatically return to the hand of the thrower, which represents the civilization and wisdom created by the indigenous residents of Australia. In the Australian park Display the "boomerang" shape on the lawn to form a wavy lawn landscape.