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除冥王星外,人类已经探测了太阳系的每一个星球,但相对于火星和金星20多次的探测而言,人类对其余的行星探测较少,认识也有限
Except for Pluto, mankind has probed every planet in the solar system, but mankind has less knowledge of the remaining planets in relation to more than 20 detections by Mars and Venus