The key to success is preparation.
成功的关键是准备。
Preparation for the party started early.
聚会的'准备工作很早就开始了。
With all the lesson preparation I have to do I work 12 hours a day.
加上必须的备课在内，我每天工作12个小时。
Careful preparation for the exam is essential.
认真准备考试十分必要。
She stressed the importance of careful preparation.
她强调了认真准备的重要性。