You cannot afford to relax your concentration for a moment.

你必须集中精力，一刻都不能松懈。

《牛津词典》

Break your concentration and the ball descends.

你注意力一旦分散，小球就会下降。

youdao

That can negatively affect your concentration and health.

睡眠不足会对注意力和身心健康造成负面影响。

youdao

Now, we're not thinking about total antibody concentration because you already have a lot of antibodies circulating within your blood and in your fluids.

现在,我们先不考虑抗体总浓度,因为你的体内已存在许多抗体,在血液以及体液中循环

耶鲁公开课 - 生物医学工程探索课程节选

When you're irritated by something, your stress hormones rise and your concentration levels decrease.

CNN: Fuzzy brain? Improve your attention span

While not addictive, "those pills can be counterproductive, since they make you jittery and decrease your concentration and ability to focus, " says Pak.

FORBES: How To Run On Fumes

Bowlers were starting to realise that if they could bowl bouncers at you at that speed they could break your concentration, so I decided that I would wear the helmet.

BBC: World Series Cricket