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.
白纹伊蚊是亚洲第二种登革热传播媒介，近几年已在美国、几个拉丁美洲和加勒比国家、部分欧洲和非洲国家扎下了根。
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。
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.
为了解决这些问题，采用二次构tin法，通过解算矢量三角形，使计算模型简单化，以便于计算机自动化实现。
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