In recent years, Aedes albopictus, a secondary dengue vector in Asia, has become established in the United States, several Latin American and Caribbean countries, parts of Europe and Africa.
Orientation can be difficult to perceive with some shapes or at small sizes, though, so it's best used as a secondary communication vector.
在某些形状下,或者尺寸较小时,方位是比较难以察觉的,因此它最好作为次要的传达矢量。
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To solve it, secondary TIN construction was conducted to simplify the calculation mode by solving vector triangle calculation so as to facilitate the automatic realization by computer.