peter grinned
彼得笑了
以上为机器翻译结果，长、整句建议使用 人工翻译 。
When Peter, who had not paid much attention, saw her suddenly in her light attire, he grinned.
彼得本来没怎么注意她，突然看见她穿着一身轻便衣服，便咧嘴笑了。
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