The difficulty in operation increases with the age of young and full age patients but decreases with the age of old people.
青壮年时期手术难度随年龄增加而增加，老年期则随年龄增加而减少。
We think one of the important reason is the long waiting period and great difficulty in operation before being listed on domestic stock market.
我们分析这其中一个重要原因是国内证券市场上市要经过很长的等待期，并且操作难度大。
In present writing thinking training exist two malpractices of inaccuracy of training stage positioning and difficulty in operation of training methods.
而现今的写作思维训练存在着训练层面定位不准和训练方法难以操作两大弊端。
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