Cassegrain
n. 卡塞格伦望远镜(亦作Cassegrain telescope)
🗣️ 情景例句
It's great. Although the economy is pretty slow as usual, it's picking up.
很好。虽然经济发展照常地缓慢，不过已开始回升。
It's a worthwhile cause.
这是值得为之奋斗的事业。
They had laboured for three years to produce this floating work of art;
瑞典人辛辛苦苦干了3年才建成这件水上艺术品，