It is primary link in the teaching course to prepare lesson.

备课是教学过程中的首要环节。

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Training activities, training needs analysis as the primary link in the training plays a fundamental, guiding role, directly determine the success or failure of training.

培训需求分析作为培训活动的首要环节，在培训中发挥着基础性、指导性作用，直接决定了培训的成败。

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Unlike their counterparts in Europe and America, the mobile in their pocket is more likely to be their primary link to the internet.

CNN: New BlackBerry must remember its strengths

The Office for State, Tribal, Local and Territorial Support (OSTLTS) serves as the primary link between the Centers for Disease Control and Prevention (CDC), the Agency for Toxic Substance and Disease Registry (ATSDR), and Tribal governments.

WHITEHOUSE: Resources within U.S. Federal Agencies | The White House

According to a press release from branding agency Millward Brown, facial coding by Affectiva and their own Link copy-testing will be the primary technique used to gauge consumer emotions.

FORBES: Neuromarketing: For Coke, It's the Real Thing