Macker
炭质页岩
🗣️ 情景例句
Do you live on or off campus?
你住在校内还是校外？
We've priced it at $ 98, almost 30% less than the competition.
我们订价为98美元，几乎少于竞争对手30%。
Once the existence of this wave-length had been discovered,
一旦这种波长的实际存在被发现，