concentration
n. 专心，专注；关注，重视；集中，聚集；含量，浓度
复数 concentrations
例句
Tiredness affects your powers of concentration.
疲劳影响注意力的集中。
《牛津词典》
She frowned with concentration.
她全神贯注，紧锁双眉。
Her brow furrowed in concentration.
她眉头紧锁全神贯注。
