Bil
基本脉冲电平（Basis Impulse Level）；基本绝缘电平（Basic Insulation Level ）
🗣️ 情景例句
She's not at home.
她现在不在家。
I guess he's about 30.
我猜他大概30岁。
Often the little words have meanings of their own.
这些小词常常都有自己本身的意思。