Boron - substituted polyaromatic mesophase prepared by co - pyrolysis of a tar pitch with pyridine - borane complex under autogeneous pressure.以煤焦油沥青和吡啶硼烷为原料采用加压热缩聚工艺制备硼取代聚芳烃中间相沥青.A new syntan product prepared with tar p...
The roof was covered with tar.屋顶涂抹了一层沥青.The pipe is caked with tar.烟斗里渍了很多油子.They drove across the river to New Hampshire on a hot tar road.他们沿着一条滚烫的柏油路开过了河，来到新罕布什尔州。...
a most instructive experience获益良多的经历While it will be fun, the seminar also promises to be most instructive.这次的研讨会不仅会有趣，而且有可能会颇具启发意义。The novel is so instructive that I can hardly tear myself away from it.这部小说很有意义,简直使我爱不释手...
The match looks like being a David and Goliath contest.比赛看上去像是一场力量悬殊的较量。a Goliath of a man巨人一般高大的男子It hit Goliath between the eyes.石头击中了戈利亚斯两眼之中的部位....
自然界中现存的生物creatures existent in nature我们有多种现存的式样供你选择.We have many patterns in stock for you to choose from.一种把数据或信息加到现存的记录中去的过程或方法.A procedure for adding data or information to an existing record....