HSK 7-9
扩充
kuòchōng动
to expand
图书馆计划扩充外文藏书。
Túshūguǎn jìhuà kuòchōng wàiwén cángshū.
The library plans to expand its foreign-language collection.
Say it
Hold the button, say it, then let go.
Other HSK words sharing a character
Also free:
Appears across levels (7-9) in the HSK 3.0 word list.