But, in relevant published textbooks and references, the analysis and calculation is either not given or not correct.

但目前的有关教材和资料对这类电路中主晶闸管反压时间的分析和计算或者有误、或者没有论述。

youdao

Textbooks and similar references continue to concentrate on the syntax and local semantics of exceptions.

教科书和类似的参考资料一直以来都集中在异常的语法和局部语义方面。

youdao

Most such references, in textbooks and museums, vanished during the Sino-Russian conflicts of the 1960s.

FORBES: Issues & Ideas