在周期的最后，磁场的两极快速翻转。
At the end of a cycle, the magnetic field rapidly reverses its polarity.
本文提出用氨气敏电极快速测定沼气发酵中氨的方法。
The ammonia comes from firedamp fermentation has been determined by ammonium - gas - sensitive electrodes with satisfactory results.
超级电脑：强力的大型电脑。它能配合极快速度和极大贮记量的需要。
Supercomputer: a very powerful mainframe computer used where extremely high speeds and storage are required.
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