China formally entered the ageing society in 1999, now it has been in the aging acceleration period.

中国在1999年正式进入老龄社会，并已经进入加速老龄化时期。

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When the acceleration period has terminated, the switch means is controlled by a PWM pulse of the duty ratio in accordance with the speed instruction data, there by driving the DC motor.

在该加速期间结束时，以占空比与速度指令数据对应的PW M脉冲来控制开关机构，从而驱动该直流马达。

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Our country is being in urbanized the acceleration period, the environment question which the city faces is day by day prominent, the city natural ecology already received the enormous destruction.

我国正处于城市化的加速期，城市所面临的环境问题日益突出，城市自然生态已经受到极大的破坏。

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If money growth continues its acceleration for a prolonged period it will finally trigger the beginning of the long awaited exit strategy of withdrawing reserves to offset the growth of the money expansion multiplier.

FORBES: Money Supply Growth Shows Stimulus Finally Getting Banks To Lend More

If there is any hope in the near future for an acceleration of political change, the period after the games will be one to watch.

ECONOMIST: China before the Olympics

If the intercepting missile is ground-launched, it must have extremely high acceleration (15 to 30g over a one-minute period) so as to arrive at the target before burnout.

CENTERFORSECURITYPOLICY: Multilateral madness