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1·Sales at malls rose in the past two months on a year-on-year basis, ending a string of declines.

在过去两个月,购物商场的销售额停止直线下降趋势，与去年同期相比开始上升。

2·And according to the International air Transport Association, an airline grouping, air freight is booming, up by 34% in May on a year-on-year basis.

而按照国际航空运输协会，今年五月份空运运价同比涨幅达到了34%。

3·Between 2008 and 2009, the data was collated on a mid-year basis, from June to May, but from last year Wrap decided to return to presenting it on a calendar year basis.

2008年至2009年间，收集数据是按照半年制进行的，从六月到下一年五月，但是去年开始，Wrap决定回归到历年制。

4·Although still down sharply year on year, electronics output (on a seasonally adjusted basis) in April-May was up by nearly 20% compared with the monthly average in January-March.

虽然环比仍然急剧下降，4到5月份电子产品出口（根据季节性调整）与1到3月份月平均量相比上升了将近20%。