その風習は日本人には全く無い。の英語

That custom is quite foreign to the Japanese.

The custom is unique to Japan.

The practice is peculiar to Japan.

This custom is peculiar to Japan.

That is a custom proper to Japan.

This is a custom peculiar to Japan.

This custom has become firmly established among the Japanese.

There is a similar custom in Japan.

I am not use to Japanese customs yet.

This is a custom peculiar to Japan.

Japan has a lot of peculiar customs, which the Japanese themselves take for granted.

There are many ancient customs in Japan.

The practice still prevails locally in parts of Japan.

There are many ancient customs in Japan.

Cleanliness is proper to the Japanese.

These customs used to prevail all over Japan.

What kind of traditional culture is in Japan?

This especially is Japanese culture.

The custom is limited to a part of Japan.

The custom is unique to China.

There are no Japanese customers coming.

This scenery is rare even for modern Japanese people.

This is the true characteristic of the Japanese race.

The custom prevails all over the country.

The custom is limited to a part of the country.

I don't think that your explanation that it is normal business practice in Japan will convince them.

This custom is limited to a part of the country.

You know a lot about Japanese customs, don't you?

This new custom has taken a firm hold on the Japanese life‐style.

That is certainly a part of Japanese culture.