1
underdevelop something
underdevelop 是及物动词，后接宾语，常见宾语为 film（胶片）或 plate（底片）。
If you underdevelop the film, the images will be too faint.
如果你让胶片显影不足，影像就会太淡。
（使）显影不足；显影不充分
underdevelops — third person singular of underdevelop
先理解核心含义，再看它在真实句子里的用法。
（使）显影不足；显影不充分
to develop (a film or photographic plate) insufficiently, e.g. for too short a time, with an ineffective solution, or at too low a temperature
If you underdevelop the film, the images will be too faint.
如果你让胶片显影不足，影像就会太淡。
此处为摄影术语，指胶片或照片显影不充分，不是“发展不完全”的意思。
发展不足；发育不充分。
To develop insufficiently.
underdevelop
Base
原形
underdevelops
3rd person
第三人称单数
underdeveloping
-ing
现在分词
underdeveloped
Past
过去式
underdeveloped
Past participle
过去分词
This chemical underdevelops the film if used too briefly.
如果使用时间过短，这种化学药剂会使胶片显影不足。
The technician underdeveloped the photo by mistake.
技术人员不小心把照片显影不足了。
The lab has underdeveloped several batches this week.
实验室这周已经让几批底片显影不足了。
常用于摄影，指显影时间、温度或药液不足；也可表示使发展不完全。
If you underdevelop the film, the negatives will look pale and thin.
如果你让胶片显影不足，底片就会看起来又淡又薄。
The student underdeveloped the photo paper because the timer was set for too short a time.
那名学生让相纸显影不足，因为定时器设定的时间太短。
The new assistant kept underdeveloping the black-and-white film by mixing the chemicals too weak.
新助手总是让黑白胶片显影不足，因为他把药液调得太稀。
underdevelop 是及物动词，后接宾语，常见宾语为 film（胶片）或 plate（底片）。
If you underdevelop the film, the images will be too faint.
如果你让胶片显影不足，影像就会太淡。
被动语态强调底片是受事，underdeveloped 在这里是过去分词，不是形容词。
The photographic plate was underdeveloped, so the picture was blurred.
这块感光板显影不足，所以照片模糊了。
Not this
This is an underdevelop country.
Use this
This is an underdeveloped country.
underdevelop 是动词，不能直接修饰名词；应改用其过去分词形式 underdeveloped 作形容词，表示“欠发达的”。
Not this
The photos underdeveloped because the developing time was too short.
Use this
The photos were underdeveloped because the developing time was too short.
underdevelop 是及物动词，意为“使显影不足”；照片作主语时表示被动结果，需要用 be + underdeveloped（过去分词），而不能使用主动语态。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
使胶片显影不足
Be careful not to underdevelop the film, or the images will look too faint.
小心不要把胶片显影不足，否则影像会看起来太淡。
使底片显影不足
If you underdevelop a negative, the shadows may lose most of their detail.
如果你把底片显影不足，阴影部分可能会丢失大部分细节。
略微显影不足的
The negatives were slightly underdeveloped, but the contrast was still acceptable.
这些底片显影略微不足，但反差仍然可以接受。
Use underdevelops naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
记忆联想：under（不足）+ develop（显影）= 显影不足，好比底片在药水里时间太短，影像很淡。
语域：formal 常见场景：photography、film processing、photo lab 该词义通常用于摄影和胶片冲洗等专业技术语境，比较正式；日常对话中较少出现。
真正押韵的词：develop、redevelop、envelop，它们都以/veləp/结尾且重音位置相同。注意：envelope 形似但发音为/ˈenvəloʊp/，尾音不同，不押韵。
Dictionary facts from ECDICT, WIKTIONARY.