To write bug-free code, practice care in handling process-wide global variables like errno and h_errno. Consider the following code.

为了编写没有bug的代码，要特别小心处理进程范围内的全局变量，如errno和h_errno。

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In handling process of raw materials, products in production, semi-finished products and finished products, be sure to label them properly, so as to avoid the mix of different types and lots.

原材料、在制品、半成品及成品搬运过程中，应作好标识，防止不同类型、批次发生混淆。

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In handling process of raw materials, products in production, semi-finished products and finished products, be sure to label them properly, so as to avoid the mix of different types and lots.

原材料、在制品、半成品及成品搬运过程中，应作好标识，防止不同类型、批次发生混淆。

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