复数： concentrations

This would also accentuate concentration in trading markets .

此举还会增强交易市场的集中度。

Pm2.5 concentration levels reached 889 micrograms at one point in january .

1月，pm2.5浓度水平曾一度达到889微克。

These are some suggestions for improving your concentration .

以下就是一些提高专注力的建议。

Spermidine concentration has been shown to decline with age .

浓缩的精索表现出对衰老过程的阻止。

After that much time , carr was intimately acquainted with the concentration , confidence or composure challenges each diver faced .

许久以后，carr熟知了每一个队员面对的来自专心，信心或沉着的挑战。