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1·The star varies in brightness by about three magnitudes.

星体的亮度大约分三个星等。《牛津词典》

2·An analog signal is composed of four basic components: DC and AC magnitudes, frequency, and phase.

模拟信号由直流和交流分量、频率和相位四部分组成。

3·These magnitudes make sense.

这样的幅度有其道理。

4·With some magnitudes this condition is fulfilled.

与一些大小，这个条件被完成。

5·The measurement accuracy was improved by several magnitudes.

测量准确度提高了几个数量级。

6·Quake locations and magnitudes are indicated by black circles.

地震的发生地和震级用黑色的圆圈表示。

7·That's because quake magnitudes are calculated on a logarithmic scale.

这是因为地震级数是按对数计算的。

8·Astronomers use a system of magnitudes to indicate how bright an object is.

天文学家利用亮度系统来标识一个物体有多亮。

9·Why are there often different magnitudes reported for the same earthquake?

为什么会经常发现同一个地震会报道成不同的量级呢？

10·One of the easiest ways to compare galaxies is to compare their magnitudes.

比较星系的最简单方法之一是比较它们的星等。

(1)order of magnitude数量级

(1)earthquake magnitude地震震级，地震等级；地震规模

(1)absolute magnitude绝对星等；绝对量级

(1)signal magnitude信号幅度