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By using this approach, three Amigobot robots can maintain the formation while there is no obstacle, and avoid by themselves or change formation in obstacles.

该方法以行为抑制法作为系统的行为选择机制，三台机器人在无障碍物时可以队形保持，在有障碍物时可以自我避障或变换队形避障。

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The percentages of the urease-producing microorganisms had no clear change in the three kinds of late rice field.

各类产脲酶菌在不同类型晚稻田的百分含量变化不很明显；

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Seventy-three percent of employers expect no change in their staffing, and the final 4% are uncertain.

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Instead, it was a multiple choice question with only three possible answers: Decrease, No Change, and Increase.

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In each case, no more than three departures were attributed to the policy change.

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