Difluoride
二氟化物
🗣️ 情景例句
and they always will be.
将来也永远会如此。
I'd say the expected delivery date should be by the end of the month.
我得说预定发货日期应该在本月底。
We tramped through the wood for over two hours until we arrived at a deep stream.
我们在树林中跋涉了两个多小时，到了一条深溪边。