secondary barrier meaning in Chinese
- 次防壁
- 第二保
- 第二道阻挡层
- 二级屏障
- secondary: adj. 1.第二(位)的，第二次的 ...
- barrier: n. 1.栅，栅栏，隔栏，障壁，隔板 ...
- nonstructural secondary barrier: 不承办次要护层
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