直接发育是指幼体和成体形态结构基本相同，仅成熟与不成熟之分，生活习性，生态需求都基本一致。如鱼类、爬行类、鸟类、哺乳类动物的胚后发育过程。
雌蕊原基由小花原基的中央部分直接发育而成。
The central part of the floret primordium changes directly into gynoecium.
这些物质直接导致了一些健康问题，比如说癌症，内分泌系统破坏以及发育问题。
These chemicals have been linked to many health issues, including cancer, hormone disruption and developmental problems.
“我们的研究证据直接表明，ADHD是神经发育失常，”他说。
"This is directly supported by our results, which provide direct evidence that ADHD is a neurodevelopmental disorder," he said.
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