Bil
基本脉冲电平（Basis Impulse Level）；基本绝缘电平（Basic Insulation Level ）
🗣️ 情景例句
C'est la vie.
生活就是如此。
Don't you have anything better to do?
你没别的事好做吗？
Sally was very excited because she had never travelled on a train before.
萨莉非常激动，因为她从未乘过火车。