Pentaborane
n. [化]戊硼烷(用作火箭推进剂)
🗣️ 情景例句
Let's see.
让我想想。
Money is a good servant but a bad master.
要做金钱的主人，莫作金钱的奴隶。
It had broken down the previous summer, and though I promised to repair it, I had never got round to it.
那台割草机去年夏天就坏了，尽管我答应修，但一直没抽出时间，