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What is the trailer in the Ethernet frame and why is the FCS incorrect?

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I captured an ARP Reply, there are both padding and trailer in the Ethernet frame.

As far as I know, padding is to make the frame length reach at least 64B.

But, what is the trailer used for?

And Wireshark does not display FCS in other frames´╝îwhy is the FCS incorrect in this frame?