[貴社の一層のご協力をお願いたします]は英語では； I would appreciate your continued cooperation. We would appreciate it if you would continue to cooperate with us. Your continued cooperation would be appreciated.

I would appreciate your continued cooperation. We would appreciate it if you would continue to cooperate with us. Your continued cooperation would be appreciated.

I would appreciate your continued cooperation. We would appreciate it if you would continue to cooperate with us. Your continued cooperation would be appreciated.

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We have been in business since 1990 and are one of the leading trading companies in Japan.