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masturbate
这是不及物用法，主语是进行自慰的人，后面不接宾语。
He masturbates in the shower.
他在淋浴时手淫。
手淫
masturbating — present participle of masturbate
先理解核心含义，再看它在真实句子里的用法。
手淫
to sexually stimulate one's own genitals for pleasure
He masturbates in the shower.
他在淋浴时手淫。
自我性刺激,尤其用手或专用性玩具达到射精或性高潮。
To stimulate oneself sexually, especially by use of one’s hand or a sex toy made for this purpose, often to the point of ejaculation or orgasm.
masturbate
Base
原形
masturbates
3rd person
第三人称单数
masturbating
-ing
现在分词
masturbated
Past
过去式
masturbated
Past participle
过去分词
He masturbates in private.
他私下里自慰。
She masturbated in the shower this morning.
她今天早上在淋浴时自慰了。
I have masturbated occasionally since college.
上大学以来我偶尔自慰过。
规则动词：-ed 形式为 masturbated，-ing 形式为 masturbating。该词直白，正式场合慎用。
He was too embarrassed to admit that he masturbated occasionally.
他不好意思承认自己偶尔手淫。
Many people masturbate to relieve stress, and there is nothing shameful about it.
许多人通过手淫来缓解压力，这没什么可羞耻的。
She felt more relaxed after masturbating before sleep.
她在睡前手淫后感到更加放松。
这是不及物用法，主语是进行自慰的人，后面不接宾语。
He masturbates in the shower.
他在淋浴时手淫。
这是及物用法，表示用手等刺激对方的生殖器以使其性兴奋。
They were taught how to masturbate a partner with their hands.
他们学习了如何用手为伴侣手淫。
Not this
He masturbate every day.
Use this
He masturbates every day.
一般现在时中，主语he为第三人称单数，谓语动词要用第三人称单数形式；masturbate的第三人称单数是masturbates。
Not this
He masturbation every day.
Use this
He masturbates every day.
masturbation是名词，不能直接作谓语；表示“手淫”这个动作应用动词masturbate，并注意主语为he时要用masturbates。
Not this
He masturbates himself every day.
Use this
He masturbates every day.
masturbate作不及物动词时本身已含有“刺激自己”的意思，再加反身代词himself会造成语义重复；直接说masturbate即可。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
私下自慰
Most people masturbate in private.
大多数人都是私下自慰的。
在公共场合自慰
It is illegal to masturbate in public.
在公共场合自慰是违法的。
自慰达到高潮
Some women find it hard to masturbate to orgasm.
有些女性觉得很难通过自慰达到高潮。
频繁自慰
The doctor asked whether he masturbated frequently.
医生问他是否频繁自慰。
看色情片自慰
He admitted that he masturbated to porn every night.
他承认自己每晚看色情片自慰。
Use masturbating naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 masturbate 拆出 mast（桅杆），想象水手独自在桅杆旁自我抚慰，即手淫。
语域：formal 常见场景：sex education class、medical consultation、health article 该词是医学/正式场合的标准说法，多用于性教育、医疗咨询或健康科普等正式语境；日常随意的口语中可能更常听到委婉表达，但这个词本身并不粗俗，属于正式措辞。
masturbate 的结尾拼写为 -bate，发音 /beɪt/。以下词中，bait、debate、rebate、incubate 都以 /beɪt/ 结尾，与 masturbate 尾音一致；create 以 /eɪt/ 结尾，也押同韵。注意：-ate 在动词中常读 /eɪt/，但在形容词/名词中常读 /ɪt/ 或 /ət/，如 private /ˈpraɪvɪt/，不要误读成 /ˈpraɪveɪt/。
Dictionary facts from ECDICT, WIKTIONARY.