重要的决定之前应当进行充分的讨论。
Important decisions should be ___preceded by thorough discussion.
一场问答环节在主新闻发布会之前举行。
A question-and-answer session ___preceded the main press conference.
这一重大突破之前是数十年默默无闻、细致入微的研究。
This major breakthrough was ___preceded by decades of quiet, meticulous research.
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