The structure of four - pillar oriented extended orientation cover is strong and survivable.
四柱導(dǎo)向,加長型導(dǎo)向套,結(jié)構(gòu)堅固耐用.
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The environment is the humanity being depended on survivable and the development physical conditions comprehensive system.
環(huán)境是人類賴以生存和發(fā)展的物質(zhì)條件的綜合體系.
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