为你解答。 As we know, dogs can be used (to guard) a house as soldiers in (both) old and modern (times). Geese have been used to give warning by (making) a lot of noise (when) an enemy comes near. But it may be (possible) to train animal to work in factories. 译：正如我们所知的那样，狗可以被用于像士兵一样看家护院，在古代和现代都是。鹅已经被用于报警了，当有敌人靠近时，它们就大声喧哗起来。但把动物培训去在工厂里干活也是有可能的。