D12 is a DC reference voltage output which serves as an AC ground .
D12是直流输出电压，它起一个交流（AC）地（的作用）。
And I decide to bring a gift from my foundation , the D12 Foundation , for you .
我觉得从我的基金D12基金里拿出一部分作为你的礼物
Here 's your boarding pass . You 'll begin boarding at 10:05 AM at gate D12 .
05分在D12口登机。
d12