所述尿道扩张导管包括设置在所述扩张导管内的上皮和闭孔装置。
The urethra dilatation catheter comprises an epitheca and a hole closing device arranged in the epitheca.
最后给出了这些结果在扩张闭模范畴中的应用。
Finally we apply these results to study extension closed categories of modules.
利用本质子群与本质扩张的概念，证明了极根类恰是本质闭类。
By the basic concept of essential subgroups and essential extensions, a surprising result is given in this paper.
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