In-depth knowledge is accumulated bit by bit.
丰富的知识是点点滴滴积累成的。
an in-depth investigation/ analysis
深入的调查/ 分析
These are just skin-deep discussions. We still need to do in-depth research.
这些只是刍论，我们还要做更深入的研究。
The working principle and hardware designing are introduced. In-depth analysis of errors is performed also.
介绍了测速系统的工作原理和硬件设计，并进行了误差分析。
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