| 单词 | protective barrier |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔BE〕Oils produced by the skin form a protective barrier against infection and disease. 皮肤分泌的油脂构成了一道预防感染与疾病的屏障。朗文写作活用〔bulkhead〕A wall or embankment, as in a mine or along a waterfront, that acts as a protective barrier.（坑内的）堵壁、堤岸、挡土墙：在矿井里或沿着水边的墙或堤，用来当作当保护物的障碍物美国传统 |
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