求翻译：工作满6年以上，担任助理工程师4年以上，可申请评定为中级工程师；工作满15年以上，担任中级工程师5年以上，可申请评定为高级工程师。是什么意思？

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work more than six years, assistant engineer may apply for more than 4 years, classified as a mid-level engineers, working more than 15 years, serving as intermediate engineers over 5 years, may apply for classified as a senior engineer.

Works above the full 6 years, holds the post of assistant engineer above 4 years, may apply for the evaluation is intermediate engineer; Works above the full 15 years, assumption intermediate engineer above 5 years, may apply for the evaluation is senior engineer.

Has worked for more than 6 years, serving as Assistant Engineers more than 4 years may apply for assessment as a mid-level engineer; has worked for more than 15 years, serving as intermediate engineers more than 5 years may apply for assessment is a senior engineer.

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