sth cracks
不及物用法，主语是出现裂缝或破裂的事物。
The ice cracked as he stepped onto the lake.
他踏上湖面时，冰裂开了。
（使）裂开；（使）破裂；打碎
cracks — third person singular of crack
发出爆裂声；噼啪作响；说俏皮话；开玩笑；猛击；重击；崩溃；屈服；招供；（嗓音）变调；变声
to break or cause something to break
形成裂缝
To form cracks.
在力、应力或压力下破裂
To break apart under force, stress, or pressure.
因心理压力而变得衰弱
To become debilitated by psychological pressure.
崩溃或屈服,尤指在审讯或拷打下
To break down or yield, especially under interrogation or torture.
发出爆裂声
To make a cracking sound.
音域快速变化
To change rapidly in register.
在最终降低过程中在高音区和低音区之间交替
To alternate between high and low register in the process of eventually lowering.
说一句尖锐幽默的评论
To make a sharply humorous comment.
意识到自己是跨性别者。
To realize that one is transgender.
使产生裂缝。
To make a crack or cracks in.
通过撞击或压力打碎或压碎成小块。
To break open or crush to small pieces by impact or stress.
用力击打。
To strike forcefully.
稍微打开。
To open slightly.
使在审讯或其他压力下屈服。
To cause to yield under interrogation or other pressure.
解决难题。
To solve a difficult problem.
破解安全系统或组件。
To overcome a security system or component.
使发出尖锐的声音。
To cause to make a sharp sound.
讲(笑话)。
To tell (a joke).
分解(复杂分子),尤指加热:热解。
To break down (a complex molecule), especially with the application of heat: to pyrolyse.
规避软件限制,如区域编码或时间限制。
To circumvent software restrictions such as regional coding or time limits.
首次与女性或女性化的人发生性关系,尤指插入式性行为。
To have sex with a female or feminine person for the first time, especially penetrative sex.
一般现在时
He cracks the code easily.
他轻易地破解了密码。
一般过去时
She cracked her phone screen yesterday.
她昨天摔裂了手机屏幕。
现在完成时
They have cracked the case.
他们已经破解了这个案件。
规则动词，过去式、过去分词加-ed。
The glass cracked when it fell on the floor.
玻璃杯掉到地上时裂开了。
用法提示：cracked 在这里表示“裂开”，是动词的过去式。
The ice on the lake cracked under the pressure.
湖面上的冰在压力下裂开了。
用法提示：cracked 表示“破裂”，描述冰面开裂。
The fireworks cracked loudly in the sky.
烟花在空中噼啪作响。
用法提示：cracked 表示“发出爆裂声”，描述声音。
不及物用法，主语是出现裂缝或破裂的事物。
The ice cracked as he stepped onto the lake.
他踏上湖面时，冰裂开了。
及物用法，宾语是被弄裂或打碎的东西。
She cracked two eggs into the bowl.
她往碗里打了两个鸡蛋。
人作主语，表示因压力、审问或拷打而屈服或精神崩溃。
The suspect cracked under hours of questioning.
嫌疑犯在数小时的审问下崩溃了。
固定搭配，表示说俏皮话或开玩笑。
He cracked a joke to break the ice.
他讲了个笑话来打破僵局。
break比crack更通用，可指完全断裂，而crack常指出现裂纹但未完全断开
split强调沿纹理或直线裂开，crack可能不规则
fracture更正式，常用于骨头或硬材料的断裂
snap强调突然清脆的折断声，常用于细长物体
burst强调内部压力导致破裂，常用于轮胎、气球等
grammar · medium
易错句子Look out — the window is crack.
正确表达Look out — the window is cracked.
描述“已经裂了”的状态时，crack 要用过去分词 cracked，构成系表结构 be cracked，不能用动词原形。中文“窗户裂了”说的是状态，英语里对应的是被动/分词形式，而不是原形动词。
grammar · medium
易错句子He finally cracked by the pressure of the exams.
正确表达He finally cracked under the pressure of the exams.
crack 表示“在压力下崩溃、屈服”时，压力前用介词 under，构成 under pressure / under the pressure of...；by 只用于引出动作的执行者。中文“在……压力下”直译成 by 是常见的介词迁移错误。
grammar · medium
易错句子He likes to crack joke with his students.
正确表达He likes to crack jokes with his students.
crack a joke / crack jokes 是固定搭配，joke 是可数名词，泛指“开玩笑”时必须用复数 jokes 或加冠词说 a joke，不能像中文那样用光杆单数。
crack 强调物体出现裂缝或裂开，但未必碎成多块；break 含义更广，可指打断、弄坏、违反等，表示碎裂时通常强调完全破坏的结果。
crack 指裂开或出现裂缝，不一定碎成小块；smash 强调用猛力把物体砸得粉碎，常伴随巨大声响。
crack 强调出现裂缝，物体可能仍相连；split 强调沿某条线裂成两半或分开，结果更彻底。
破解密码
The hacker managed to crack the code in just a few hours.
黑客仅用几小时就破解了密码。
讲笑话
He always cracks a joke to lighten the mood.
他总是讲个笑话来缓和气氛。
砸开坚果
She used a nutcracker to crack the walnut.
她用胡桃夹子砸开了核桃。
在压力下崩溃
Some people crack under pressure, but she thrives.
有些人在压力下会崩溃，但她却表现得更好。
露出笑容
It was hard to crack a smile after hearing the bad news.
听到坏消息后很难露出笑容。
开玩笑
He always cracks a joke to lighten the mood.
他总是开玩笑来缓和气氛。
严厉打击
The government is cracking down on illegal parking.
政府正在严厉打击违规停车。
（使）大笑；（使）崩溃
Her funny story made everyone crack up.
她有趣的故事让所有人都笑翻了。
我们将破解密码。
The team worked together to crack the code.
团队合作破解了密码。
开一瓶酒，让你的身体摇摆。
He cracked a bottle of champagne to celebrate.
他开了一瓶香槟庆祝。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY, WORDNET.
打破僵局
A funny story can crack the ice at a party.
一个有趣的故事可以在聚会上打破僵局。