由于P1和P2已经是标准化格式，组合过程只是简单的从每个替代中取出断言，最后形成一个包含所有断言的新的替代。

Since P1 and P2 were already in Normal form, the combining process is simply a matter of taking an assertion from each alternative and forming new alternatives that contain all the assertions.

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替代了之前把实验鼠的皮肤细胞变为干细胞的状态，然后再形成心脏细胞器官，研究者直接把皮肤细胞转变为心脏细胞。

Instead of taking mouse skin cells all the way back to a stem cell state and then coaxing the cells to form heart tissue, the researchers switched the cells directly from skin to heart cells.

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这两个替代结合起来形成交互式替代。

These two alternatives are combined to produce the intersected alternative.

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