顺行和逆行 apparent retrograde motion
半保留复制和逆转录 Semiconservative replication and Reverse transcription
汇和逆汇 Remittance and Honor of Draft
逆转录病毒和逆转座子 Retroviruses and retroposons
偶然和逆偶然 Accident and Converse Accident
顺钟向和逆钟向转位 clockwise and counterclockwise rotation
镜头和逆望远型 retrofocus lens
预防进展和逆转 prevention of progression and reversal
敢于直面压力和逆境 Take decisive actions
协变和逆变的区别对于张量的计算尤为重要，这往往会出现混合方差。
The distinction between covariance and contravariance is important for computations with tensors, which often have mixed variance.
最后就是对协变和逆变的支持了。
什么是拼缀法、缩略法和逆 生法？
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