程序可以注册处理各种类型的信号，但是信号可能会在最不合适的时候出现，包括您正在处理另一个信号的时候。
Programs can register to handle various kinds of signals, but signals can happen at the most inopportune times, including while you're already handling another signal.
他和他的同事应用不同的化学生长信号物质处理骨髓得到两种不同类型干细胞然后连同供者气管交付GOSH科学家。
He and his colleagues prepared two different types of stem cells from the bone marrow together with some growth signalling chemicals and returned them to GOSH with the donor trachea.
《工程测试技术》这门课程主要讲了测试的基本原理、信号的分析和信号处理、传感器类型，测试系统的特性以及现代测试技术。
Engineering testing technique is mainly about the fundamental principles of testing, the analysis and process of signals, sensors types, features of testing system and modern testing techniques.
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