那是一只狗吗

is that a fact───这是事实吗

like cat and dog───就像猫和狗一样

sick as a dog───病得十分严重

to hot dog───去热狗

The second rule is that a dog should never show its fear to the enemy.───第二条规则是狗永远不应该对敌人表现出畏惧。

Sheldon: Is that a dog?───是狗在叫吗?。

that a dog?───那是一条狗吗？

A very simple example is that a dog or a cat in North America eats better than a child in the poorer countries.───一个极简单的例子是北美的狗或猫比穷国的孩子吃的更好。