HSK 6
热线
rèxiàn名
hotline (communications link)
有问题可以联系服务热线。
Yǒu wèn tí kě yǐ lián xì fú wù rè xiàn.
You can contact the service hotline if you have a problem.
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 6.