Thanks for your help. I followed your configuration but it seems not working.
I plugged in a computer at ge-0/0/3, then run
root@SRX> monitor traffic layer2-headers no-resolve detail interface ge-0/0/3
The computer is configured to use DHCP for configuration, but nothing happened in packet capture. I also tried ge-0/0/0, ge-0/0/3.34 and ge-0/0/0.34, only silence.