Ssts
abbr. signaling and supervision techniques study 信号传送与监听技术研究; space surveillance and tracking satellite 空间监视与跟踪卫星; space-based surveillance and tracking system 天基监视与跟踪系统
🗣️ 情景例句
He felt that his life was no longer worth living.
他觉得他的生命已经没有再活下去的价值了。
More die by food than by famine.
饥馑而死的少，饱食而死的多。
For a beginner, you're pretty good.
做为一个初学者，你已经做得很好了。