abbr.task initiation date 任务起始日期，test instrumentation development 测试仪表的研制
The tidal stream or current gradually decreases in the shallows.
浅滩上的潮水逐渐退去。
The river is tidal up to this bridge.
这条河的潮水会涨到这座桥.
a tidal wave of crime
犯罪高峰期
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