That's a rare event, however, and requires that two flu strains invade a single cell, replicate and then get their products mixed up in the packaging.
然而这是罕见的，而且需要两种流感病毒进入同一个细胞中，复制然后在包装过程中其产物混合。
To facilitate the lottery, prizes, not easy to automatic measurement of objects or various materials mixed product packaging.
便于将奖券、奖品、不易自动计量的物体或多种物料混合产品包装使用。
In the formula of the method, all components are dispersed to be mixed and are subject to melting by a double screw extruder, mixing, extrusion, cooling, drying, granulating and packaging.
该方法是将配方中各组分分散混合后，通过双螺杆机熔融、混炼、挤出、冷却、干燥、切粒和包装。
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