If it's a single value (for example, an upper bound on a shoe size, or the maximum number of monkeys that can fit in a barrel), leave the constant as it is.

如果只有单独一个值(例如，鞋的最大尺寸，或者笼子中能装猴子的最大数目)，则还是把这个任务留给常量吧。

youdao

Apparently you need three barrels of Saudi crude to get the same number of barrels of diesel you could get from one Libyan barrel.

很明显，三桶沙特原油生产的柴油数量才相当于利比亚一桶原油生产的柴油数量。

youdao

The heat gun's name and model number are located on a black label on the bottom of the heat gun's barrel.

该加热枪的名称和型号位于加热枪管底部的一张黑色的标签上。

youdao

Since 2004 Saudi Aramco has been fighting declining oil output from megafields like 70-billion-barrel Ghawar by doubling the number of drilling rigs to 120 this year.

FORBES: Oil Gleaners

Since 1999, the five-fold increase in the number of dollars it takes to buy a barrel of oil has simply caught up to the five-fold increase in the number of dollars it takes to buy an ounce of gold.

FORBES: Angry Over Oil Price? Demand A Change In Fed Policy

Further the number of gallons of gasoline produced per barrel heavy crude oil is lower than for light crude oils.

FORBES: China's Not Going Green