Not: Addition of water gives product.

　　But: Addition of water gave product.

　　Use the active voice whenever possible. (尽可能使用主动语态)l

　　Not: It was observed that the solution turned red.

　　But: The solution turned red.

　　OR We observed that the solution turned red.

　　Complete all comparisons. (使用完整的比较形式 A is higher than B)l

　　Not: The yield was higher using bromine.

　　But: The yield was higher using bromine than chlorine.