Even though one or two degree Celsius rise in sea surface temperature for a relatively short amount oftime can cause bleaching.
即使海面温度在短时间内升高一到两摄氏度，也可能会引起褪色。
2
Prices fluctuate, in response to harvests, natural disasters and political instability; and when they rise, it takes some time before new sources of supply become available.
价格会随着收成、自然灾害和政治不稳定而波动；当价格上涨时，需要一段时间才能找到新的供应来源。
3
The web has allowed new providers of news, from individual bloggers to sites, to rise to prominence in a very short space oftime.