我们需要做哪些保护措施？
施工现场沙石、土方等散体材料必须严密遮盖等。[{'character': '施', 'pinyin': 'shiii1', 'highest pitch': 10.67, 'lowest pitch': 9.88, 'duration': 0.25, 'prosody hierarchy': 'null'}, {'character': '工', 'pinyin': 'gong1', 'highest pitch': 11.15, 'lowest pitch': 9.88, 'duration': 0.19, 'prosody hierarchy': '#1'}, {'character': '现', 'pinyin': 'xian4', 'highest pitch': 11.25, 'lowest pitch': 9.21, 'duration': 0.25, 'prosody hierarchy': 'null'}, {'character': '场', 'pinyin': 'chang3', 'highest pitch': 9.21, 'lowest pitch': 4.94, 'duration': 0.3, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.09}, {'character': '沙', 'pinyin': 'sha1', 'highest pitch': 11.21, 'lowest pitch': 10.42, 'duration': 0.32, 'prosody hierarchy': 'null'}, {'character': '石', 'pinyin': 'shiii2', 'highest pitch': 11.21, 'lowest pitch': 6.77, 'duration': 0.32, 'prosody hierarchy': '#2'}, {'character': '土', 'pinyin': 'tu3', 'highest pitch': 6.88, 'lowest pitch': 5.13, 'duration': 0.24, 'prosody hierarchy': 'null'}, {'character': '方', 'pinyin': 'fang1', 'highest pitch': 10.56, 'lowest pitch': 5.37, 'duration': 0.25, 'prosody hierarchy': '#1'}, {'character': '等', 'pinyin': 'deng3', 'highest pitch': 10.37, 'lowest pitch': 6.06, 'duration': 0.17, 'prosody hierarchy': '#1'}, {'character': '散', 'pinyin': 'san2', 'highest pitch': 10.01, 'lowest pitch': 6.26, 'duration': 0.22, 'prosody hierarchy': 'null'}, {'character': '体', 'pinyin': 'ti3', 'highest pitch': 10.36, 'lowest pitch': 6.63, 'duration': 0.17, 'prosody hierarchy': '#1'}, {'character': '材', 'pinyin': 'cai2', 'highest pitch': 7.0, 'lowest pitch': 5.54, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '料', 'pinyin': 'liao4', 'highest pitch': 7.17, 'lowest pitch': 5.01, 'duration': 0.25, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.23}, {'character': '必', 'pinyin': 'bi4', 'highest pitch': 7.91, 'lowest pitch': 6.86, 'duration': 0.15, 'prosody hierarchy': 'null'}, {'character': '须', 'pinyin': 'xv1', 'highest pitch': 8.56, 'lowest pitch': 8.05, 'duration': 0.29, 'prosody hierarchy': '#2'}, {'character': '严', 'pinyin': 'ian2', 'highest pitch': 9.05, 'lowest pitch': 6.32, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '密', 'pinyin': 'mi4', 'highest pitch': 10.72, 'lowest pitch': 7.45, 'duration': 0.2, 'prosody hierarchy': '#1'}, {'character': '遮', 'pinyin': 'zhe1', 'highest pitch': 8.2, 'lowest pitch': 7.43, 'duration': 0.17, 'prosody hierarchy': 'null'}, {'character': '盖', 'pinyin': 'gai4', 'highest pitch': 8.07, 'lowest pitch': 6.34, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '等', 'pinyin': 'deng3', 'highest pitch': 10.37, 'lowest pitch': 4.17, 'duration': 0.25, 'prosody hierarchy': '#4'}]