fraction of sample in gas phase

例句：

1. 1.The scientist analyzed the sample and determined its fraction of elements.
   科学家分析了样本，并确定了其元素的比例。
2. 2. The company decided to cut back on its expenditures by halving its fraction of expenses.
   公司决定将其开支减半，以减少其支出比例。
3. 3. The chef prepared a fraction of the ingredients for each course.
   厨师为每道菜准备了一小部分食材。