Backing vacuum
[化] 前级真空
🧩 词语组成解析
backing
[['bækiŋ]]
n. 后退, 衬背, 后援, 支持者\\n[化] 衬垫
🗣️ 情景例句
Who jammed the photocopier, again?
谁又把复印机卡住了？
A clear conscience is a soft pillow.
问心无愧，高枕无忧。
What about vegetables?
蔬菜呢？