Perfidiousness
背信弃义\\n叛卖
📖 牛津释义
perfidiousness
n [U].
🗣️ 情景例句
What's the deadline for claim?
索赔的有效期多长？
I'm all mixed up.
我全搞混了。
Good morning, class! Who is on duty today?
同学们，早上好！今天谁值日？