At that time comic books were produced at an astonishing pace. Publishers would get books in Japan that hadn't even appeared yet in the Japanese market. Everything including translation, typesetting, printing and distribution could be completed in about three days. Thus you really could say that they appeared "simultaneously" with those in Japan.
那時漫畫的出書速度非常快，出版社在日本拿到未上市的新書，就立刻空運來台，連口譯、打字、製版、印刷、裝訂、配銷，總共約三天就完成，真可說是與日本「同步」發行。