Finally, spin relaxation of polarized atom due to spin-exchange collisions and spin-destruction collisions is put forward.

最后，提出了因自旋交换碰撞和自旋销毁碰撞引起的极化原子的自旋弛豫。

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The reasons behind the drop were unfavorable foreign exchange and the 20% spin-off of Zoetis.

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Joe Cornell, founder of Chicago-based Spin-Off Advisors, says the next step will likely be an exchange offer from Pfizer later this year, giving shareholders the ability to exchange some of their holdings for shares in the animal health business, likely at a discount to incentivize participation.

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