“fluctuations in prices”可以造什么句，fluctuations in prices造句

These speculators exacerbated the fluctuations in prices since they helped bid up oil prices further when they were high, and helped lower them further when these prices were low.

Meanwhile, affected by production costs, steel prices in 2011 will be relatively high; however, fluctuations in prices may be seen and so traders should be more cautious.