在String构造函数运行之前，Object的构造函数将用它们默认的值初始化所有字段，包括决定性的长度和偏移字段。
Before the String constructor runs, the constructor for Object will initialize all fields, including the final length and offset fields, with their default values.
当String构造器运行时，字符串长度和偏移量被设置成所需要的值。
When the String constructor runs, the length and offset are then set to their desired values.
当介质的速度在横向上存在较大的变化时，波动方程时间偏移不能使地下的构造正确成像。
Wave equation time migration fails to image subsurface geological structure correctly in the case of obvious lateral seismic velocity variation.
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