A test and pressure relief valve should be installed to assure relief of internal pressure prior to servicing and as a visual indication of trapoperation.
应该安装一个测试和压力安全阀，确保内部压力能够在维修前得到释放，并作为疏水阀工作的直观显示。
2
Under UNIX, calling the kernel consists of an operation known as a syscall or trap.
UNIX下的内核调用由所谓的syscall或者trap操作构成。
3
In application system, Using trap technology to deal with suddenly event can improve dependability, flexibility, operation convenience of application system.