现在有多少种猪流感病毒？
这种猪今后全期的生长都会表现缓慢。
Such pigs then continue into the growing period with poor growth.
这种猪流感是如何传播的？
我们都能通过卖种猪赚钱。
肉质对我们选种猪来说也是至关重要的。
这种猪出肉率高。
以前，人们并没有发现这种猪的流感会在人类之间传播。
Ago, people did not find this pig influenza would be spread between humans.
然而，假定在这只良种猪产出小猪以前，它被一棵倒下来的树压死了。
However, suppose that a tree falls on the superior pig before it has produced offspring.
这种猪流感病毒的遗传物质组成与研究人员曾经遇到了任何一种都不一样。
The genetic make-up of this swine flu virus is unlike any that researchers have seen.
这种猪流感病毒的遗传物质组成与研究人员曾经遇到了任何一种都不一样。
The genetic make-up of this swine flu virus is unlike any that researchers have seen.
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