外表看起来严肃 Appeared serious but soft
只是看起来严肃 Just look serious ; Only appears serious
严肃起来
Get serious
以上为机器翻译结果，长、整句建议使用 人工翻译 。
他说话的语气变得严肃起来。
His voice took on a more serious tone.
《牛津词典》
她的表情显得严肃起来。
Her expression grew solemn.
她的脸显得严肃起来。
Her face grew solemn.
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