In the first, three key elements of production dictionary for learners are proposed as criteria based on which we can judge whether a dictionary is designed for learners' production or not.

首先，作者提出了为学习者设计的表达词典应该具有的三个要素。

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Network marketing can make the marketing activities of companies and three mobile elements and smooth operation combine to form a production and operation of a virtuous circle.

网络营销可以使企业的营销活动始终和三个流动要素结合并流畅运行，形成企业生产经营的良性循环。

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Breathe sound production and resonance are three key elements of sing and three important sectors of vocal music teaching.

歌唱的呼吸、发声、共鸣是歌唱的三要素，是声乐教学的三个重要环节。

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