GFRP	glass fiber reinforced polymer
THz-TDS	erahertz time-domain spectroscopy
1D-CNN	one-dimensional convolutional neural network
LSTM	long short-term memory
THz	Terahertz
NDT&E	non-destructive testing and evaluation
RNN	recurrent neural network
1D-CSNN	one-dimensional convolutional skip-connected network
SAF	strong absorption frequency
WAF	weak absorption frequency