In a negative copy the tonal values are reversed . 在负片拷贝中，色调值是反转的。
2.
The american market turned round sharply a week ago . 美国证券市场于一周前急遽反转。
3.
Each reversal appears to have taken place in a very short time . 每一次反转看来都是在极短的时间内发生。
4.
The necessary population inversion can be achieved in a variety of ways . 我们可以用各种方法来实现这种必要的粒子数反转。
5.
Baltimore shared a nobel prize in physiology or medicine in 1975 for the discovery of reverse transcriptase . 巴尔帝摩由于发现了反转录酶在1975年分得了诺贝尔生理学或医学奖。
6.
When the sun's rotation sweeps this warped surface across the earth, we detect sudden changes in the polarity of the magnetic field . 当太阳的自转使这个波浪形间隔面扫过地球时，我们就会探测到磁场极性的突然反转。
7.
The contacts representing successive increment of time in the outputs can be looked upon as the sweeping of the reversed and unreversed signals . 代表输出中时间连续增量的各接触点，可以被看成是反转和未反转信号的扫描。
8.
The most common method to "pump" a gas laser--that is, to invert the population in the states that give rise to light amplification--is to use a gas discharge . “发射”气体激光（也就是反转能产生光放大的那些状态的粒子数）的最普通方法是运用气体放电。
9.
Advances in retrotransposon in animal genome 动物基因组中反转录转座子的研究进展
10.
Others spin around , causing left right reversals 也有人四处打转，使左右反转。
