1. It is an acid produced from coal-tar. 
   这是从煤焦油中提出的一种酸。
2. They will report on the experiments with coal tar. 
   他们将汇报煤焦油的试验情况。
3. a tar formed from distillation of bituminous coal; coal tar can be further distilled to give various aromatic compounds. 
   蒸馏生煤得到的焦油，继续蒸馏能得到各种芳香族化合物。
4. a colorless oily compound extracted from coal tar and used in manufacturing synthetic resins. 
   一种无色油状的合成物，从煤焦油中提取，用于制造合成树脂。
5. Loose hemp or jute fiber, sometimes treated with tar, creosote, or asphalt, used chiefly for caulking seams in wooden ships and packing pipe joints. 
   麻絮，埋絮疏松的大麻或黄麻纤维，有时涂上焦油、杂酚或沥青作保护层，主要用于木船上捻缝和填塞管子接头

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