Vfss
[计]= Voice Frequency Signalling System,音频信号系统
🗣️ 情景例句
He worked his way through college.
他半工半读念完大学。
If she could help you, she would help you.
如果她能帮你，她一定会的。[虚拟语气]
from which can be seen the strata the drill has been cutting through.
从中能看出钻头所钻透的地层。