The first step is a button trap which prevents small objects such as lint, fasteners, buttons, and coins from entering the solvent pump.

第一步是一个按钮，防止细小的物体，如林特，紧固件，按钮，和硬币进入溶剂泵。

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They basically trap for null or empty values in the event that the user clicks the Search button without selecting valid options for both usage and configuration.

它将在用户没有为配方和用法选择有效的选项就单击Search按钮时跟踪null或空值。

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They basically trap for null or empty values in the event that the user clicks the Search button without selecting valid options for both usage and configuration.

它将在用户没有为配方和用法选择有效的选项就单击Search按钮时跟踪null或空值。

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