Vpd
[醫(yī)][=variation per day]日變量
??? 情景例句
What classes are mandatory for your major?
你的專業(yè)什么課是必修的？
I often watch TV at night.
我常常在晚上看電視。
But my baby, I can't leave her by herself.
可是我的孩子……，我不能把她一個人留著呀。”