Only about one-fourth of land is suitable for rice fields or dry farmland. Then if you take into consideration the difficulty of irrigation, you can understand the difficulties the development of the agricultural industry has faced.
而在山坡地多的通霄鎮裡，可耕的水田、旱地僅約佔了四分之一，加上灌溉水源取得不易，在農業發展上難免有縛手縛腳之苦。