The secondary challenge is to optimize the allocation and integration of inputs necessary to meet pre-defined objectives.

其次的挑战是最优化的配置和整合投入，以达到预先确定的目标。

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That same secondary task - the grocery list - becomes more of a challenge when driving to a different grocery store using an unfamiliar route.

但是，如果你走一条新路线去不同的超市的时候，脑中处理第二件任务：需要买些什么，则会比较困难。

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Treatment of deep circumferential bony defects around the mandibular secondary molars is a great challenge to periodontist.

治疗下颚第二大臼齿远心侧的环绕型骨性破坏，是牙周病科医师的一大挑战。

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To address this challenge, a three-day International Conference on "Integration of Academic Courses with Vocational Education in Secondary Schools" was organized jointly on 17-19 February in New Delhi by UNESCO, the National Institute of Open Schooling (NIOS) and the Commonwealth of Learning.

UNESCO: EDUCATION

"From the start of secondary school, young people, including both high ability and struggling readers, tend to read books that do not challenge them enough, " said Prof Topping, from Dundee University's school of education.

BBC: Teenagers' book choices 'go for easier reads'