Parents and teachers say children are having memory and concentration problems.

家长和老师都反映孩子有记忆力不好与注意力分散的问题。

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The scattering problems and the dynamic stress concentration problems of SH-wave by double circle cavities, and circle lining in near field are investigated in this thesis by the method of FEM.

本文采用有限元法研究近场双圆形孔洞、圆环形衬砌对瞬态sh波的散射和动应力集中问题。

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He pleaded family problems for his lack of concentration.

他解释说注意力分散是因为有家庭问题。

《牛津词典》

Lyrica causes side-effects in some patients, including problems with mental concentration and attention.

VOA: special.2011.08.02

As for James. he has admitted to concentration problems in the past but he is older and wiser now.

BBC: World Cup scouting: goalkeepers

It can also lead to concentration problems, anxiety, impulsive behaviour and depression.

ECONOMIST: A scientific row has broken out over the effects of Ecstasy

Should the parents tell their children: 60% of NFL players have had at least 1 concussion, 26% had 3 or more, collectively claiming loss of memory, concentration, and problems with speech, headaches, and other neurological issues?

FORBES: Connect