Question

幕の内

傍線部（3）の ｢no doubt that ｣（最初のthis is の直後のところです）の｢that｣の用法を教えて頂きたいです！
このthatがなんのthatなのが分からなくて……

よろしくお願いします！

(1)
It is normally very difficult for the Japanese businessman to discuss anything
other than business. The habit is considered somewhat rude and boring in many
foreign countries. To have a well-rounded personality, it is important to have
some knowledge of other aspects of life, such as politics, economics, sports, theater
5 and music. Exposure to many aspects of everyday life is one sign of the well-
rounded executive. Unfortunately, most Japanese businessmen have very little
interest in learning about these other areas.
(2)
(3)
There is no doubt that the world considers the Japanese businessman one of
the most hard-working in the world. But as Japanese business becomes more and
10 more internationalized, its representatives must change their image of "all
business and no play." In the United States, many executives of large
corporations are quite interested in other aspects of life. They enjoy art, theater,
music and sports.
A good starting point for the Japanese businessman is to become associated
15 with the cultural arts of Japan which are now well-known in the Western world.
Many Westerners know more about Japanese people, sports, customs and arts
than some Japanese.

Answer 1

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さ や

このthatは接続詞です。名詞節を導いていて「同格のthat (～という)」と呼ばれる働きをしています
There is no doubt that ～「～という疑いはまったくない→間違いなく～」

さ や

同格のthat の部分は、
consider A B「AをBとみなす」
という表現に注目して意味を考えてみてください。

幕の内

ご返信ありがとうございます！とても助かりました（お礼が遅くなってしまってすみません！）もう一度ちゃんと読み直してみたら、確かに同格のthatでした、、意味の考え方も教えて頂きありがとうございます🙏