同期 tóngqī the corresponding time period
the corresponding time period (in a different year etc); concurrent; synchronous
How to remember 同期: 同 same + 期 a period of time = the corresponding time period.
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How it is used
- The corresponding period in another cycle - 去年同期 (qùnián tóngqī) the same period last year; core to reporting and statistics.
- Also 'concurrently': 同期上映 (tóngqī shàngyìng) released at the same time. Written/formal in the statistical sense.