Specific impulse
[化] 比冲量
🧩 词语组成解析
🗣️ 情景例句
Don't be lazy, the older you get, the harder it will be to learn.
别偷懒，年纪越大，学起来就越难。
I can't recall how long it's been.
我不能记起多长时间了。
He was on his way to a lecture, when a tourist stopped him and asked him for directions.
他走在去听课的路上，此时一位游客拦住他问路。