hillyadj.多小山的；丘陵的hilly red soil region红壤丘陵区hilly tea plantations丘陵茶园Hilly red soil regions红壤丘陵区Hilly and plain region丘陵平原区hilly land agriculture丘陵山区农业Hilly area expressways山区高速公路hilly-type flat area山丘区型平坦呕域hilly and gullied area丘陵沟壑地区hilly semi-arid area丘陵半干旱区hilly and gully region丘陵沟壑区