Space exploration is a challenge to human beings. That's why several nations try hard to carry out space exploration continuously.
太空探索对我们人类来说是个挑战，这也是为什么许多国家不断进行探索的原因之一。
Space exploration is a challenge to human beings. That 's why several nations try hard to carry out space exploration continuously.
太空探索对我们人类来说是个挑战，这也是为什么许多国家不断进行探索的原因之一。
Space exploration is a challenge to human beings. That 's why several nations try hard to carry out space exploration continuously.
太空探索对我们人类来说是个挑战，这也是为什么许多国家不断进行探索的原因之一。
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