n.集中；專(zhuān)心；濃度

The tennis players need total concentration during play. 網(wǎng)球運(yùn)動(dòng)員在比賽中需要全神貫注。

Concentration is essential if you want to do a good job. 如果你想把事情做好,專(zhuān)心是必要的。

His area of concentration is economics. 他專(zhuān)心研究經(jīng)濟(jì)學(xué)。

Check oxygen concentration by a refractometer. 用折射儀測(cè)量一下氧氣的濃度。

Titanium is useful at low concentration only. 鈦只在低濃度時(shí)起作用。

濃聚物

n.分散