his face became serious
他的脸变得严肃起来
以上为机器翻译结果，长、整句建议使用 人工翻译 。
He smiled briefly, and then his face became serious.
他淡淡一笑，然后他的脸严肃起来。
youdao
The secrecy was serious: when he spoke of spirits, his smiling face became deadly sober and even scared.
ECONOMIST: Mau Piailug
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