Your track is diverging from reference line.
你船的航迹和参照线不平行。
The cure for object loitering in this case is to null out the reference after popping it from the stack, as shown in the commented-out line of code in Listing 3.
修复这种情况下的对象游离的方法是，当对象从堆栈弹出之后，就消除它的引用，如清单3中注释掉的行所示。
To reference a given DB2 instance from a command line interface, use the environment variable DB2INSTANCE.
要想从命令行接口引用给定的 DB2 实例，应该使用环境变量 DB2INSTANCE。
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