英汉词典

1. 干净的;洁净的;无污迹的
    Something that is clean is free from dirt or unwanted marks.

    e.g. He wore his cleanest slacks, a clean shirt and a navy blazer...
           他穿着他最干净的便裤，洁净的衬衫和藏青色上装。
    e.g. Disease has not been a problem because clean water is available...
           不必担心会生病，因为能喝上干净水。

2. (人或动物)讲卫生的，爱干净的
    You say that people or animals are clean when they keep themselves or their surroundings clean.

3. (燃料或化学作用)无害的，无污染的，清洁的
    A clean fuel or chemical process does not create many harmful or polluting substances.

    e.g. Fans of electric cars say they are clean, quiet and economical.
           电动汽车迷们说，电动车清洁、无噪音而且经济。