1·Many studies and reports have been seen and heard, but there is no definitive answer as to what holds the title of the dirtiest spot in the restroom.
许多被看到和听到的研究报告，在用什么作为肮脏的洗手间的标题上，却并没有确定的答案。
2·Who should be held accountable for anti-terrorism’s dirtiest business?
谁该为反恐活动中最肮脏的交易负责？
3·But Dong, like many coal companies, is keen to give the dirtiest fossil fuel a makeover.
不过，东能源公司像其它许多煤炭公司一样，热衷于改造肮脏的矿物燃料。
4·Even a fox will lick its hindquarters, but some of the faeries were the dirtiest beasts.
就连一只狐狸也会舔后腿，可是有些仙灵是最肮脏的野兽。
5·But coal is also seen as the dirtiest fuel.
但是煤炭也被看作最肮脏的燃料。