HSK 5
开通
kāitōng动
to open (a new road or railway line); to set up (a hotline); to launch (a service); to subscribe to (a members-only service)
这条地铁新线路已经开通。
Zhè tiáo dì tiě xīn xiàn lù yǐ jīng kāi tōng.
This new subway line has opened.
Say it
Hold the button, say it, then let go.
Other HSK words sharing a character
Also free:
New in the HSK 3.0 word list at level 5.