基本解释[化学]返回脱硫法英汉例句双语例句In the heart of the book moving heart-sweetening story, I was always in difficulties and frustrations is to encourage me, dont back.书中感人心腑的故事，总是在我受到困难和挫折是鼓励我，不要后退。back sweetening更多例句专业释义化学返回脱硫法