In fact, new breeds of dogs can be raised by cross-breeding, and the breed with ancient history is very difficult to find.

实际上，新的品种是被杂交过的品种，并且，具有古代历史的品种十分难以找到。

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Boston terrier: any of a breed of small dogs originating in New England as a cross between a bull terrier and a bull dog and having a smooth, brindled or black coat with white markings.

波士顿狗：一种原产于新英格兰的小狗，是牛头和牛头犬的杂交品种，具有光滑的、有斑纹的或黑色的带白斑的皮毛。

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