Definition: being the main or most important part of something Level: B1
基本问题是他们交流不够。
The ___basic problem is that they don't talk to each other enough.
他开始教我核物理学的基础知识。
He started to teach me the ___basic knowledge of nuclear physics.
基本原则是要诚实。
The ___basic principle is to be honest.
