词汇	a dull day
释义	a dull day 阴天自然
随便看	obstacle of system Obstacle of translation obstacle of vibration Obstacle optimal control problem obstacle overcome ability obstacle overcoming mechanism obstacle overstepping obstacle path obstacle perception obstacle performance obstacle plan Obstacle Planning System obstacle probe obstacle problem obstacle problems obstacle profile obstacle quasi-static crossing obstacle race obstacle race carrying heavy equipment obstacle racer obstacle races obstacle recognition obstacle remover obstacle-ridden obstacles