看门狗

The watch-dog has lainqiet on the hearth,and the cattle have stood silent in, their stalls.

看门的狗静静地躺在暖炉旁，牛羊在栏阁里悄无声息。

Dog need not keep the gate, all day take a sunbathe;Cat need not catch a rat, whole day nap.

狗不用看门了，成天晒太阳；猫不用抓老鼠，整天打盹。

And to protect livestock, consider using guard animals such as dogs, donkeys, llamas and even ostriches.

同时为了保护家禽，还要考虑使用看门的动物，比如说狗，驴子，骆驼，甚至鸵鸟。

These friendly dogs, which were first brought from Asia, were used as watchdogs even in roman times.

这些狗，一开始是从亚洲引进的，甚至从罗马时代就用来看门

E.g. The dog was often used to keep watch and hunt for wild animals.

过去狗常被用来看门和狩猎。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。