Ssto
abbr. single-stage to orbit 单极轨道
🗣️ 情景例句
Sure.
当然可以。
Whe angry, count ten before you speak; if very angry, a hundred.
怒时数十再说话，大怒数百方开言。
He is heavily insured against death.
他给自己投了巨额的人身保险。