中英释义：
双语例句
本文对该算法进行了优化处理，实现了栅格矢量化半自动跟踪和面状地物中心线提取。
This paper not only improved this algorithm but also implemented semi-automatic tracking grid-vectorization and central line pick-up using this algorithm.
重点词汇
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半自动
semi-automatic
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跟踪
track; follow; tail; shadow; trail; monitor; surveil; stalk; dog; follow the tracks of; pursue; tail after; follow the tracks of sb; chart; tracking; tailing; trace; pursuit; surveillance; on tail