As increasing of motorcycles, the motorcycle exhaust pollutant is getting stronger day by day.

随着摩托车保有量的增加，摩托车排气污染成为日益严重的社会问题。

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We reported just a short time ago about the new BlackBerry retail store opening in Nigeria and it seems that the BlackBerry market in Africa is getting stronger day by day.

前段时间我们报道了黑莓零售商店在尼日利亚开张，现在看来黑莓在非洲的生意越来越好。

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And despite the ups and downs associated with a recovery, that economy is getting stronger by the day.

WHITEHOUSE: President Obama Hails Progress on Wall Street Reform

So, despite temporary setbacks, uncertain world events, and the resulting ups and downs of the market, this economy is getting stronger by the day.

WHITEHOUSE: Moving Forward on a New Foundation

And while we recognize that our recovery is still in its early stages and that there are going to be ups and downs in the months ahead -- things never go completely in a smooth line -- this report is a sign that our economy is getting stronger by the day.

WHITEHOUSE: President Obama on the May Jobs Numbers