例句與造句

1. To optimize the difficult synthesis which used the toxic gas phosgene ( carbonyl chloride ), Kern entered into a collaboration with the German chemist Heinrich Caro at BASF . Kern also found that by starting with diethylaniline rather than dimethylaniline, he could synthesize the closely related violet dye now known as C . I . 42600 or C . I . Basic violet 4.
2. It's difficult to find basic violet in a sentence. 用basic violet造句挺難的