B
生物医药大词典
by MedSci
菜单
词典
分类
百科
诗词
背单词
英文名
DeepEvidence ↗
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例句 /
The protective plastic jacket consists mainly of polyurethane.
The protective plastic jacket consists mainly of polyurethane.
现在给瓶子包上一层用聚安酯制成的外套。