Considering Pluto's small size, it was a surprise to see that its gravity was strong enough to hold on to an atmosphere at all.
鉴于冥王星个头很小，看到其引力竟然足以“拴住”大气层很让人意外。
Because of its economy and safety, the masonry gravity dam is used in many medium and small-sized engineering.
浆砌石重力坝由于其经济性和安全性，在很多中小型工程中被采用。
Because of its economy and safety, the masonry gravity dam is used in many medium and small-sized engineering.
浆砌石重力坝由于其经济性和安全性，在很多中小型工程中被采用。
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