基础 (jī chǔ): ฐาน

The foundation of learning Chinese is pinyin.

This plan has a good foundation.

We need to build a solid foundation before we can learn advanced courses.

The foundation of this building is very solid.

When learning Chinese, the foundation is very important.

The foundation of this building is very solid.

We need to build a good foundation in mathematics.

This is the most basic knowledge; you must master it.

On the original basis, we made improvements.