This fear dates back to at least the invention of movable type.
这种担心可以追溯到至少是活字印刷术的出现。
Yates: Printing and movable type were certainly two of them.
答：印刷和活字印刷术肯定是这类发明中的两个。
Movable type equipment can be placed according to actual environment;
移动式设备，可根据实际环境放置；
Movable type equipment can be placed according to actual environment;
移动式设备，可根据实际环境放置；
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