open-faced

詳細解釋：

o.pen-faced

adj.（形容詞）
Having a face that seems to exhibit honesty and sincerity.
相貌老實的，坦率的：看起來相貌坦率誠實的
Having a side uncovered:
有一面沒有被覆蓋的：
例句：
an open-faced sandwich.
無蓋三明治