在辅助T细胞激发针对病原的免疫反应之前，它必须感觉到位于抗原递呈细胞面表的入侵者分子片段。
Before a helper t cell can trigger a response to a pathogen or parasite, it has to "feel" these molecular bits of an invader displayed on the surface of an antigen-presenting cell (APC).
它是生成三维立体地貌，计算地面距离、坡度、土方、面表积等的基础数据模型，也是巡航飞行器地形相关匹配的基础数据。
It is the basic model for various GIS operations, and the key data for terrain correlation matching of cruise missiles as well.
另一方面就是比时间表更早地开始你的一天。
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