To look at each other and smile, with a perfect understanding in one's heart; implying a deep friendship and mutual affinity where thoughts align without words.
他们相识多年，彼此信任，每次遇到难题，总能相视而笑，莫逆于心，共同找到解决办法。
They had known each other for many years, trusting each other deeply. Whenever they encountered difficulties, they would always exchange a knowing look and smile, understanding each other perfectly, and find solutions together.
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