对给定数量的汽油，其产生的有效动力与它的热值成正比。
The power available from a given quantity of gas is directly proportional to its heating value.
正如立法者深知羞耻感是促使我们端正自身行为的有效动力一样，我们可以借用围绕着新年之际的朝气，为自己内心的转变添加动力。
As legislators have always known the feeling of shame is a useful incentive to good behavior. We can use the energy that surrounds the birth of a New Year to lend our own inner change some impetus.
英国有大量的煤；然而，当时还没有有效的方法来产生机械能或为机器提供动力。
Great Britain had large amounts of coal; however, there were not yet efficient means by which to produce mechanical energy or to power machinery.
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