以下为句子列表：
英文: However, it is not appropriate for covering large chest wall defect due to its conventional shape of the cutaneous island, which needs additional skin grafts for the donor site and results unsightly scar over the upper back.
中文: 然而，它并不合适于重建大面积胸壁缺损，因爲其本身岛状表皮之形状，会使得皮瓣之供皮区无法直接缝合而需植皮，进而造成上背部难看之疤痕。
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