So thermodynamics, based on these four laws now, requires an edifice, and it's a very mature science, and it requires that we define things carefully.
热力学是一座,建立在这四条定律上的大厦,它是一门非常成熟的科学,也要求我们在定义东西时非常小心。
So these empirical observations then are summarized into four laws.
这些经验性的观察,被总结成四条定律。
Well, there are four principal ways that composers signal to us the whereabouts of the down beat.
以下有四条主要途径,是作曲家用来告诉我们重拍在哪里的
He lists four such questions.
他条列了四条这样问题。
So, initially they came up with four lines and then eventually five and even six, and then they went back to five by the fifteenth century.
那么,他们最初提出的是四条线,但是最终却是五条线,甚至六条线,然后在十五世纪又回到了五条线
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