Spaceflight
n. 外层空间飞行
🗣️ 情景例句
People don't ask unmarried people Why are you single?.
人们不会问未婚的人“你为什么不结婚？”。
A secret between more than two is no secret.
两人以上知道的秘密就不算秘密。
Even more processes are never patented at all but kept as secret processes.
更多的工艺过程根本就不会取得专利权，而是作为秘方保存着。