SDL recommended by CCITT is an international standard language with which software function and behaviour can be specified and which has been widely used in the field of SPC switching systems.

SDL是CCITT推荐的用于描述软件功能和行为规范的国际标准语言，并已广泛应用于程控交换领域。

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He discovered that if just 30 people in a standard carriage with 151 passengers used their phone radiation levels exceeded the limits recommended by the International Committee for Non-Ionising Radiation.

BBC: Trains 'trap mobile phone radiation'