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secondary protective barriers
secondary protective barriers
英
[secondary protective barriers]
美
[secondary protective barriers]
中文释义
二次防护层
单词分析
单词结构:
secondary protective barriers
字母数:29
记忆提示
🎯 重点记忆:
单词拼写:secondary protective barriers
核心含义:二次防护层
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更新时间:2026-02-03 22:29:07