It helps in comparison of columns and helps identify relationship among source and target objects.

它有助于对列进行比较，有助于确定源对象和目标对象之间的关系。

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So, it's up on this screen here now, so we'll work on the other one. If you can identify which of these statements is correct based on what you know about the relationship between frequency and wavelength and also just looking at the waves.

它们之间的关系,现在在大屏幕上了,鉴于你们知道,频率和波长的关系,看到这些波你们来,判断下这些说法是否正确。

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