the second simple development
the second simple development
第二个简单的发展
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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Trower's second stage of robotic development includes simple, single-purpose robotic devices like the Roomba or Looj, along with toy robots like WowWee's Robosapien or Lego Mindstorms, a set of programmable robot-building pieces.
FORBES: Household Robots