拥有DTD总是值得的，因为工具箱中那些较老的产品不能使用更新的模式语言。
It always pays to keep a DTD around, because some of the older products in your toolkit might not work with more recent alternatives.
开会的实质是图纸碰头会，一般设计院设计的标准都是老标准，电子科技产品的更新日新月异。
The meeting is meeting the general design drawings, Design Institute standards are the old standard of Electronic Science and technology product updates change rapidly.
用PLC替代老设备的继电器控制箱，使产品更新换代。给出了替代的一些步骤和方法。
Control case with the relay of PLC replacing old equipment, make produce renew, have given some replacing step and method.
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