Working with an older system, the programmer and operator have to be aware how a part should be properly bent to ensure efficiency and avoid collisions.

在更旧的系统上工作时，程序员和操作工必须要清楚一个零件如何被合适地折弯，保证生产效率，并且避免发生碰撞。

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To get all subordinates over all levels, the PRIOR operator must be added to the CONNECT BY part of the hierarchical query clause.

要获取所有级别上的所有下属，必须将PRIOR运算符添加到分级查询子句的CONNECT BY部分。

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Avoid the use of the comma operator except for very disciplined use in the control part of for statements.

避免使用逗号操作符，除非在特定的for语句的控制部分。

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