trunk occupancy
干线占用（Trunk Occupancy） TSAPI：电话服务应用规划界面（Telephony Services Application Programming Interface）
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受迫地域主要是指大中城市的郊区及交通干线两侧耕地易被占用的区域。
The suffered area is referred to outskirts of big and medium-sized cities and both sides of main lines of communication where farmland is liable to be occupied.
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