按照指定的规则改变数据形式，而数据的含义并无明显的变化。
To change the form of data according to specified rules, without significantly changing the meaning of the data.
虽然在此过程中经历了数次兴衰起伏，壁画的基本功能与表现形式在二十世纪之前却无明显的变化。
Having undergone rise and decline in the thousands of years, however, the basic function and manifestation of mural had no obvious change before 20 ~ (th) century.
对于不同初始密度的试件，破坏强度有随初始密度的增加而变大的趋势，但破坏应变则无明显的变化规律。
And for the specimens with different initial density, their failure stresses increases with the increment of initial density, but failure strain does not present any obvious regular patterns.
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