Bifrequency
双频率的
🗣️ 情景例句
What a bargain! Thanks for helping me with this shopping.
真是太划算了！谢谢你带我买这些东西。
Do they have children?
他们有孩子吗？
If they knew how difficult it was to drill through the hard rock, they would lose heart.
如果他们知道了钻透那坚硬的岩石有多么困难，他们会丧失信心的。