Lucy has a round face,but Lily has a long face 合并为一句
问题描述：
Lucy has a round face,but Lily has a long face 合并为一句
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答
Lucy has a round face while Lily has a long one.Lucy的脸是原的而Lily的脸是长的.while是而的意思.句里用one因为前面已出现里名词face,避免重复而把同一个名词变为one.