在我国保险法中，保险合同的无效制度不很完善。
The nullification system of insurance contract is not quite perfect in the insurance law of our country.
时序线路的设计方法迄今仍不很完善，而随机型逻辑线路的设计就研究得更少。
So far, there are no perfect methods for designing sequential circuit, while researches on designing stochastic circuit are even fewer.
时序线路的设计方法迄今仍不很完善，而随机型逻辑线路的设计就研究得更少。
So far, there are no perfect methods for designing sequential circuit, while researches on designing stochastic circuit are even fewer.
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