New flu vaccines need to be made each season because the viruses are constantly changing so as to avoid attack by host immune defences - whether in birds, humans or other animals.
每个季度都要制造新的流感疫苗是因为流感病毒会不断地变化从而逃避宿主(无论是人类、鸟类还是其他动物)免疫防线的攻击。
I made a simple hexagon shape as my host object, and selected four of my previously made grass components to be scattered.
我制作了一个简单的六角形作为我的主体对象，并选择了四个我之前制作的小草组件进行分散。
Fortunes will begin to be made in the textile industry and in the railroad industry by the '40s and' 50s, and in a host of other ways, real fortunes.
在40 50年代的时候，纺织业和铁路工业将会制造大量的财富，另一些方面，真正的机遇。
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