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。
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。
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