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a/the submarine + verb
submarine作为可数名词，常用冠词修饰。
The submarine surfaced at dawn.
潜艇在黎明时浮出水面。
潜艇
先理解核心含义，再看它在真实句子里的用法。
潜艇
a boat that can travel underwater, especially a warship
The submarine surfaced at dawn.
潜艇在黎明时浮出水面。
可以潜入水下的船
A boat that can go underwater.
通常装备有鱼雷的潜水战舰
a submersible warship usually armed with torpedoes
下手投出的球
A pitch delivered with an underhand motion.
用长而脆的面包卷切开并填充肉类和奶酪(以及番茄、洋葱、生菜和调味品)的三明治；在美国不同地区有不同的名称
a large sandwich made of a long crusty roll split lengthwise and filled with meats and cheese (and tomato and onion and lettuce and condiments); different names are used in different sections of the United States
The submarine disappeared below the surface within seconds.
那艘潜艇几秒钟内就消失在水面以下。
They watched a documentary about how submarines work.
他们看了一部关于潜艇如何运作的纪录片。
The crew on the submarine stayed underwater for three months.
潜艇上的船员在水下待了三个月。
submarine作为可数名词，常用冠词修饰。
The submarine surfaced at dawn.
潜艇在黎明时浮出水面。
及物动词后接submarine作宾语。
They launched a submarine yesterday.
他们昨天发射了一艘潜艇。
submarine用作定语，表示'海底的'。
Submarine cables connect continents.
海底电缆连接各大洲。
Not this
There are many submarine in the navy.
Use this
There are many submarines in the navy.
Submarine为可数名词，复数形式应加-s，此处使用单数形式不符合语法。
Not this
The submarin is under water.
Use this
The submarine is under water.
拼写错误：submarine的正确拼写包含字母e，误删导致拼写错误。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
核潜艇
The navy launched a new nuclear submarine yesterday.
海军昨天发射了一艘新的核潜艇。
潜艇船员
The submarine crew trained for months before the mission.
潜艇船员在执行任务前训练了数月。
潜艇基地
They stationed several submarines at the submarine base.
他们在潜艇基地部署了几艘潜艇。
潜艇战
Submarine warfare was crucial during World War II.
潜艇战在第二次世界大战中至关重要。
潜艇三明治
I ordered a foot-long submarine sandwich for lunch.
我午餐点了一个一英尺长的潜艇三明治。
潜艇面包卷
The submarine roll was filled with turkey and cheese.
潜艇面包卷里夹着火鸡和奶酪。
(俚语)指青少年开车到影院约会接吻的活动
They said they were going to a submarine race, but we knew they just wanted to park and make out.
他们说要去潜艇比赛，但我们知道他们只是想停车亲热。
我们都住在黄色潜水艇里。
The Beatles' song 'Yellow Submarine' made the submarine a symbol of peace and love.
披头士的歌曲《黄色潜水艇》使潜水艇成为和平与爱的象征。
Use submarine naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
sub-下，marine海洋，潜艇就是海面下的船。
submarine（潜艇）: 军事、海洋场景; submarine（三明治）: 美国餐饮、快餐场景
Words sharing the prefix 'sub-' (subway, substitute, submerge) do not rhyme with submarine. 'Marine' shares the ending '-ine' but is pronounced /məˈriːn/ with a long e sound, while submarine ends in /iːn/ after /m/, so they do rhyme in some accents? Actually, submarine has stress on the last syllable? No, stress is on the third syllable: /ˌsʌbməˈriːn/. The stressed vowel is /iː/ and the following sounds are /riːn/. 'Marine' stressed on second syllable: /məˈriːn/ so the stressed vowel is also /iː/ and ending /riːn/? Wait, marine is /məˈriːn/ so it ends with /riːn/? Actually marine: /məˈriːn/ has the same /riːn/ as the last two syllables of submarine? Submarine: /ˌsʌbməˈriːn/ - the last two syllables are /məˈriːn/ so actually /məˈriːn/ is exactly marine? Yes, the last two syllables of submarine are the same as marine: /məˈriːn/. So they do rhyme perfectly if we consider the last two syllables? But typically rhyme requires same stressed vowel and following sounds. The primary stress in submarine is on the last syllable: /riːn/? Actually, pronunciation: /ˌsʌb.məˈriːn/ - primary stress on the final syllable /riːn/ (often indicated as /ˈriːn/ in some dictionaries, but the main stress is on the last syllable). Yes, so the stressed vowel is /iː/ and the rest is /n/ (since /r/ is before? Actually /riːn/ includes /r/ which is part of the onset of the stressed syllable? In 'marine', the stressed syllable is /riːn/ as well. So they rhyme. So we can say marine rhymes. But note 'subway' does not rhyme. So in pronunciation_note mention that marine rhymes exactly, while words with 'sub-' prefix share spelling but not sound.
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.