不计其数
bù jì qí shù
countless
Character by character
不bù
not
not
计jì
count
count
其qí
their
their
数shù
number
number
Example
每年来这里旅游的人不计其数。
Countless tourists come here every year.
Tone: neutral.
Usage and origin
数 is shù here (number); compare 屈指可数, where it is the verb shǔ.
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