Her brow furrowed in concentration.

她眉头紧锁全神贯注。

《牛津词典》

He wrinkled his brow in concentration.

他全神贯注地锁紧眉头。

《牛津词典》

His face was a study in concentration.

他脸上完全是一副全神贯注的表情。

《牛津词典》

His four sisters remained in Vienna and were all killed in Nazi concentration camps.

VOA: special.2010.04.13

In the case of a ligand-receptor, a chemical signal in the form of a concentration of ligand gets converted into a biochemical signal.

在配体-受体系统中,配体浓度这种化学信号,转化为生化信号

耶鲁公开课 - 生物医学工程探索课程节选

But when the concentration in the alloy is 50/50 by mole, something magical happens.

但是当合金中的浓度,是1比1的时候，有些神奇的事发生了。

麻省理工公开课 - 固态化学导论课程节选

In it, mutants had been rounded up in concentration camps as a result of the Mutant Control Act.

FORBES: Anna Paquin, Shawn Ashmore and Ellen Page Are On Board for 'X-Men: Days of Future Past'

Nearly 180 men were executed there and many women and children from Lidice were murdered in concentration camps.

BBC: Lidice

Asked the simplest of questions, the deputy editor of the weekly newspaper Kontras in Banda Aceh frowns in concentration.

CNN: ASIANOW - TIME Asia