She gave a slow smile.
她慢慢地笑了笑。
《牛津词典》
Gradually his countenance cleared, and he began to smile long, slow smiles.
渐渐地，他的脸色开朗了，开始慢慢地长时间地挂着微笑。
youdao
A slow smile spread over it and the gardener looked quite different.
园丁慢慢地绽开了笑容，看上去很不一样。
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