求翻译：气相色谱法能够测定空气中的四氢呋喃[3]，具有较好的灵敏度及选择性，但仪器体积相对较大，操作相对复杂。即使是便携式的气相色谱检测仪也不能实现实时和连续监测。气体传感器具有体积小，携带方便，可实时、连续检测气体的特点，是仪器分析发展的一个重要方向。而目前极少有监测四氢呋喃传感器的报道。市面上的手持式四氢呋喃传感器，是利用电化学和催化燃烧的原理，这种传感器的选择性较差[4]。因此，发展简单、稳定的四氢呋喃气体传感器是人们所期盼的。是什么意思？

Gas chromatography to determine the air in THF [3], has good sensitivity and selectivity, but the relatively large size of the instrument, the operation is relatively complex. Even the portable gas chromatography detector can not achieve real-time and continuous monitoring. Gas sensor is small, port

gas chromatography can be measured in the air, and 4 hydrogen furan [ 3] it has better sensitivity and selectivity, but apparatus size relatively large, relatively complex. Even the portable gas chromatograph-mass spectrometer detector cannot achieve real-time and continuous monitoring. gas sensors

The gas phase chromatography can determine in the air four hydrogen fu nan [3], has the good sensitivity and the selectivity, but instrument volume relative big, the operation is relatively complex.Even if is the portable gas chromatography instrumentation cannot realize real-time and the continuous

Gas chromatography determination of tetrahydrofuran in the air [3], which has good sensitivity and selectivity, but relatively large instrument volume, operation is relatively complex. Even a portable gas chromatograph detector and cannot implement real-time and continuous monitoring. Gas sensor wit

Gas chromatography determination of tetrahydrofuran in the air [3], which has good sensitivity and selectivity, but relatively large instrument volume, operation is relatively complex. Even a portable gas chromatograph detector and cannot implement real-time and continuous monitoring. Gas sensor wit