玩球的驱力是个好例，而它是构成日后多种多样工作的基础。
Ball drive is a good example since it forms the foundation for so many types of work.
假设这条狗有良好强壮的神经，相当高的阈值，一条拥有强大防御驱力的犬会成为优秀工作犬。
Assuming the dog has good, strong nerves and a reasonably high threshold, a dog with strong defense drive can be a good working dog.
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