directed areas的用法和樣例：
例句
- By defining the directed area of polygons, We went into its properties and applications andobtained several new fixed value theorems of polygons.
通過給出平面多邊形的有向面積，探討有向面積的一些性質和應用，提出一平面多邊形的若干新的定值定理。
directed areas的相關資料：
臨近單詞
Directoire
direct
direct-injection cylinder head
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direct access program name table
direct current partial discharge
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direct current integrating meter
