time keeping instrument的用法和样例：
例句
- These mixtures of astronomical instruments and time-measuring devices cannot be seen as independent time measurers.
这类计时器尚不能算是独立的计时器，还是天文仪器与计时仪器的混合体。 - The steelyard clepsydra, a special type of clepsydra, had been the chief timekeeping instrument during the Sui-Tang period and the earlier stage of the Northern Song dynasty.
摘要秤漏是一种特殊类型的漏刻，在隋唐及北宋前期曾是司天机构的主要计时仪器。
