長年の取引で、相手との信用関係を築いた。
Naganen no torihiki de, aite to no shin'you kankei o kizuita.
We built a relationship of trust with the partner through many years of transactions.
信用を失うような行為はしてはいけない。
Shin'you o ushinau youna koui wa shite wa ikenai.
You should not engage in actions that would lose trust.