您要查找的是不是：
- 聚-5-乙烯四唑（PVT）poly (5-vinyltetrazole) (PVT)
- 四four
- 5-肼基四唑5-hydrazinotetrazole
- 5-氨基四唑衍生物5 - ATZ derivatives
- 乙烯四聚ethylene tetramerization
- 四個(gè)tetrad
- 用三乙烯四胺丙烯酸鹽增強丁腈橡膠Reinforcing acrylonitrile-butadiene rubber by triethylene tetramine acrylate
- 四唑脲tetrazole urea
- 四年four years
- 四級four-stage
- 四國Shikoku
- 聚（2,5-苯并咪唑）ABPBI
- 四大the four elements [earth, water, fire, wind]
- 四部four-part
- 四處all over the place
- 聚四氟乙烯polyfluortetraethylene
- 四倍fourfold
- 四舍五入round
- 乙烯四甲酸[化] ethylene-tetracarboxylic acid
- 三乙烯四胺triethylene tetramine
