HSK 5
随时
suíshí副
at any time; at all times; at the right time; whenever necessary
有问题可以随时联系我。
Yǒu wèn tí kě yǐ suí shí lián xì wǒ.
You may contact me at any time if there is a problem.
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Other HSK words sharing a character
Also free:
New in the HSK 3.0 word list at level 5.