Hoʻololi ʻia ka kānana ea i hoʻokahi makahiki a i ʻole 10000-15000 km. ʻO ke kuleana o ka kānana ea ea: 1, e hāʻawi i ka ea hou i loko o ke kaʻa; 2, adsorption o ka makū a me nā mea ʻino i ka lewa; 3, e mālama i ka maʻemaʻe o ka ea ʻaʻole e hānai i ka bacteria, e hōʻoia i ka palekana a me ke olakino......
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