大家在查：达·格戴兰 constant=true Pynchon birettas 振耀 Sejila 0.51亿 CT断层伊丝特

8xy

8xy

8xy

8xy

1

The entire second term with dy goes away because dy is zero. And, in the first term , 0 8xy goes away because y is zero as well.

这个带 dy 的第二项消去，因为 dy 是 0 ，第一项中，8xy 消去，因为 y 也是。

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