TriBot 的第二个版本是在第一个版本之上添加一个缓冲器，这个缓冲器负责感知机器人是否遇到了障碍物。
The second version of the TriBot builds upon the first by adding a bumper that senses when the robot runs into an obstacle.
社会支持特别是来自朋友的支持作为缓冲器能降低应激障碍，社会支持的多少也影响应对策略的选择。
As a buffer, social support especially from friends can decrease stress disorder. The amount of social support also affects choosing coping strategies.
安全装置有：识别树枝、石头、障碍物； 具有缓冲特征的传感器； 割草机升降装置以及儿童锁。
Safety features including: identifying trees, rocks and obstacles, sensor equipped bumpers, mower lift detection and child lock.
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