This method has clear and definite geometric background.
这种方法具有明确的几何背景。
Thus, The range of regional snail control is clear and definite.
从而明确了区域性灭螺的范围。
This pattern makes the structure clear and every division has its definite function.
这种设计模式使系统结构层次清晰，各部分模块划分明确。
This pattern makes the structure clear and every division has its definite function.
这种设计模式使系统结构层次清晰，各部分模块划分明确。
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