HSK 3
Jīntiān de zhuāntí shì huánbǎo.
Today's special topic is environmental protection.
HSK 3
Wǒmen zuò le yí gè zhuāntí bàogào.
We made a special topic report.
HSK 4
Zhège zhuāntí yánjiū le sān nián.
This special topic has been researched for three years.
