Protoyping
n. 原型;样机开发;研究
🗣️ 情景例句
Really, Grandpa?
真的， 爷爷？
There's no such thing as a free lunch.
天下没有白吃的午餐。
it takes much less energy to accelerate to that 1.5 miles per second than it does on Earth.
在月球上加速到每秒1。5英里比在地球上所用能源要少得多。