还解决了制冷机的可靠性，寿命和存贮期等实用化问题。
Some key problems such reliability, the life time and the stores etc had been introduced in the paper.
但是它也存在一些问题，如参数的平稳性和模型实用化问题。
But it also has some problems, such as riding index of parameters and practicability of load model.
然而，为改进其水动力学性能和促进其实用化，尚有一些问题需要解决，例如有关三体船构型与阻力性能的关系。
There, however, are still some problems to be tackled to improve its hydrodynamic performances and promote its practical use, such as the relation between the configuration and its resistance.
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