One thing that can hold joy back is a person's concentration on avoiding failure rather than their looking forward to doing something well.

有一件事会抑制快乐，那就是一个人专注于避免失败，而不是期待把事情做好。

youdao

They made a joyful sound, but again I lost my concentration on God.

我又一次走了神。

youdao

Tennis requires great strength in the arms and legs as well as strong concentration on the game.

打乒乓球不仅需要强壮的臂力和腿部力量，还需要集中精力。

youdao

Paul Pillar,a former senior CIA intelligence officer now with Georgetown University's School of Foreign Service, favors a shift away from direct combat operations to a concentration on training Afghanistan's army and police, and economic development.

VOA: standard.2009.10.15

The structural moment of concentration on the code for its own sake cannot be avoided, and literature necessarily breeds its own formalism.

集中在代码上的结构瞬间,因为它本身的原因不可避免，文学必要地导致了它自身的形式主义。

耶鲁公开课 - 文学理论导论课程节选

So, this is several months and this logarithmic scale on the Y-axis represents antibody concentration.

这是在几个月内,这里使用的是对数刻度,Y轴代表的是抗体的浓度

耶鲁公开课 - 生物医学工程探索课程节选

David gathered himself in a great effort of concentration on the children, his younger children.

NEWYORKER: The Swan

In part, this is because of its concentration on selling basic foodstuffs, which are largely recession-proof.

ECONOMIST: Smaller South Korean firms

The Conservative concentration on tax cuts shows that, for them, the poor are just the losers.

BBC: Don't forget the don't-care vote