infra-red technique

例句：

1. 1. The infra-red technique is used to detect the presence of heat sources.
   红外技术用于探测热源的存在。
2. 2.This infra-red technique can help us identify objects that are difficult to see with the naked eye.
   这种红外技术可以帮助我们识别肉眼难以看见的对象。
3. 3.Infra-red techniques have been widely used in medical imaging and remote sensing.
   红外技术在医学成像和遥感领域得到了广泛应用。