答案来了：
本篇文章是与时间有关的，属于科普知识。慢速英语，语速正常。可以作为口译入门或基础英语听力口语听写的素材。大家快来挑战自己吧！
Time is a dimension.
时间是一个维度。
Just like length, breadth or height.
就像长、宽、高一样。
But whereas we can move in any direction in those other three dimensions, we can only move in one direction of time, forward, relentlessly.
但是，尽管我们可以在其他三个维度的任何方向移动，时间维度只能单向移动，只能不断前进。
Why?
为什么呢？
Why can’t we ever move backwards in time?
为什么我们不能回到过去呢？
For a long while scientists couldn’t come up with a convincing explanation.
很长一段时间，科学家们无法给出令人信服的解释。
The laws of physics, you see, work fine whether you’re going forwards or backwards in time.
物理定律可以有效解释，无论你在时间维度上想要向前，还是向后。
Their answer finally came from an unexpected place – steam engines.
最终，答案来自一个意想不到的地方——蒸汽机。
At the start of the industrial revolution, engineers were trying to understand how to make steam engines more efficient.
工业革命初期，工程师们正在试图了解如何使蒸汽机的效率更高。
In examining how all that heat and energy moved around an engine, they developed a whole new branch of science which they called, appropriately, thermodynamics.
通过研究所有的热量和能量是如何在发动机周围流动的，他们创立了一门全新的科学分支，恰当地称之为热力学。
But it turned out that thermodynamics could explain the behaviour of a lot more than just steam engines.
但事实证明，热力学可以解释的不仅仅是蒸汽机的行为。
解析在这里哦！
1. dimension，名词，表示“维度”，比如：A line has one dimension.（直线是一维的。）
2. relentlessly，副词，表示“不断地”，比如：She always questioned me relentlessly.（她总是无休止地问我。）
3. appropriately，副词，表示“恰当地”，比如：The chain of volcanoes is known, appropriately enough , as the ‘Ring of Fire’.（人们把这链状火山群很恰当地称作“火环”。）
4. thermodynamics，名词，表示“热动力学”。
