Satellorb
模擬人造衛(wèi)星的觀察與研究氣球
??? 情景例句
Strike while the iron is hot.
趁熱打鐵。
Every tree is known by its own fruit.
觀其言行，知其為人。
Oh, yes, I bought one, but I can't find it now.
噢，是，我買了票的，但現(xiàn)在找不見了！