profit margins decline的用法和樣例：
例句
- A sluggish economy and increased competition brought about by economic reforms are squeezing profit margins.
市場需求不旺，經濟改革加劇了行業競爭，導致公司利潤率下降。 - Higher crude oil and natural gas realizations and improved marketing margins were partly offset by lower chemical margins.
原油與天然氣價格上漲以及銷售利潤率提高部分抵消了化學產品利潤率下降的影響。
