Bil
基本脉冲电平（Basis Impulse Level）；基本绝缘电平（Basic Insulation Level ）
🗣️ 情景例句
Considering the friendly relation between us,
鉴于我们之间的友好关系，
He who is afraid of asking is ashamed of learning.
害怕问者耻于学。
but where had it come from?
但它是从哪儿来的呢？