One's inner thoughts or feelings are revealed through their speech and facial expressions; to show in one's words and demeanor.
他虽然嘴上没说什么，但脸上的疲惫和语气中的无奈都形于言色，让人一看便知他遇到了麻烦。
Although he didn't say anything, the fatigue on his face and the helplessness in his tone were evident in his words and expressions, making it clear to anyone that he was in trouble.
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