By flipping this field's polarity the DNA strand can be ratcheted along, one base pair at a time.
通过转动电场的极性，DNA链会渐进式地前进，一次一对碱基对。
2
This would lead to an equal recovery of any fall over time given a polarity reversal.
因此随时间的任何一次下跌都被给予了均等的极性翻转的恢复。
3
The polarity of impulse voltage and the polarity of insulator surface electric charge can affect the corona initial time of insulator, the change time - interval and the corona current.