be certain to短语⁴⁹⁰⁹⁴ 基本例句 prep.确信深信 Be certain to set aside at least an owe a day to sports. It be to do you healthy or energetic. 务必每一天至少留出一个小时参加体育活动，这会使你身体健康，精力充沛。 ffenglish Be certain to wash all cutting boards and utensils that may have come in contact with meat before using them to prepare other foods. 确保所有可能接触肉类的切菜板和做饭工具都被彻底洗净，再用它们来做别的食物。190190.net