basics ·phrase
Definition: the most important facts, skills, or needs Level: B2
我真的必须学习急救的基础知识。
I really must learn ___the ___basics of first aid.
去年，我选择带团队去帆船和潜水旅行，因为我已经知道帆船和潜水的基础知识。
Last year, I chose to take groups on sailing and diving trips because I already knew ___the ___basics of sailing and diving.
在开始高级课程之前，你需要掌握基础知识。
Before starting the advanced course, you need to master ___the ___basics.