An orange dog一只橘色的狗
is an orange dog是橙色的狗;是一个橙色的狗;是个橙色狗
Only one orange dog一只橘色的狗
Bob is an orange dog鲍勃·是橙狗;鲍勃是橙色的狗;鲍伯是橙色狗;鲍勃是一个橙色的狗