谁是你的爸爸？ ！
I eat breakfast every dy . Do you eat breakfast every day?
我每天都吃早餐，你每天吃早餐吗？
On the math it is a line integral of something dx plus something dy.
从数学意义上来说，这是dx部分加上dy部分的线积分。
The structure of DY type outlet and its jet performance was described.
介绍了DY型风口的结构及射流特性。
The damping down charge defined dy this method can return furnace production; to normal quickly.
此法所确定的高炉休风料能使复风后高炉生产迅速转入正常。
The damping down charge defined dy this method can return furnace production; to normal quickly.
此法所确定的高炉休风料能使复风后高炉生产迅速转入正常。
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