The present paper aims to analyze the root of the power that a contract has, and probe into the form of a contract and the legal power that it is short of based on a comparison.
本文拟从契约效力的根源着手分析，从比较法的角度对合同形式及其欠缺的法律效力进行探析。
Due to the wide use in the fields such as textile, equipment, papermaking, metallurgy, machine, etc., roller's lapse form is a vital part to probe into.
压光辊(轧辊)在纺织、器材、造纸、冶金、机械等行业中应用极为广泛，对其失效形式的探讨显得至为重要。
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