Cold trap using liquid nitrogen to achieve a constant input of rapid cooling, so that rapid nucleation of steam to ensure that the nanometer scale.
冷阱采用了不断输入液氮实现了急速冷却，使蒸汽快速成核以保证纳米尺度。
2
Volatile components from castrated and intact male rabbit meat were trapped using the improved nitrogen purge and trap(NPT)technique and were analysed by gas chromatography mass spectrometry(GC?MS).