中文词源
periodic 周期性的
来自period,周期，时期。
英语词源
- periodic (adj.)
- 1640s, from French périodique (14c.), from Latin periodicus, from periodus (see period).
Periodic table in chemistry (1889) is from notion of the arrangement, in which similar properties recur at intervals in elements in the same area as you read down the rows of the table. This sense of the word is attested from 1872 (periodic law).
权威例句
- 1. There may be periodic police "sweeps" of crime in the area.
- 警方可能对该地区的犯罪活动进行定时的“扫荡”。
- 2. Periodic checks are carried out on the equipment.
- 设备定期进行检查。
- 3. Long long ago, we knew the periodic motion of a planet.
- 很久以前, 我们就知道行星的周期运动.
- 4. These arrangements are subject to periodic reviews.
- 这几项安排每隔一定时间须予复查.
- 5. Periodic checks are taken to ensure that high standards are maintained.
- 定期检查以确保维持高水准。
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