Among the principal volatile compounds, the compounds such as hexanal, ethyl acetate, methyl dodecanoate, 2,5-dimethyl furan, 1,3-butanediol, 2-ethylphenol, 2-butanol, α-bergamotene, β-caryophyllene, ...

The term 4×4 means a four-wheel-drive vehicle. Technically, the first digit is the number of wheels and the second is the number that are driven, so a four-wheel-drive pickup truck is a 4×4 ...