分析比较了对电子合同要约和承诺撤销的各种看法，并认为不应否认电子合同要约和承诺的可撤销性。

Analysing some views about the voidableness of offer and promise, this dissertation draws a conclusion that the electronic contract is still voidable.

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对于这一系列做法的很多方面存在争议是可以理解的。但是这些做法在速度上和可撤销性上都有巨大的优势。

There is understandable controversy about many aspects of these actions but they had the great advantages of speed and reversibility .

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很多学者认为合法性是婚姻的本质属性，无效婚姻与可撤销婚姻不是婚姻。

Many academicians think that legitimacy is marriage's essential attribute, void marriage and cancelable marriage are not marriages.

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