英语短语 "through and through" 是一个常用的强调性表达，核心含义是 "彻底地、完全地"，或 "从头到尾/贯穿地"，可用于描述本质特征、熟悉程度、物理穿透或状态的彻底性。以下是具体解析：
1、 抽象层面：强调本质上的彻底性（如性格、特质、认知）；
2、 物理层面：表示完全穿透/贯穿（从一端到另一端）；
3、 状态层面：描述程度的极致（如湿透、冻透）。
用于强调某人或某物从内到外、毫无保留地具备某种特征，常与表示性格、身份的形容词/名词搭配。
He’s a gentleman through and through—he always holds doors for others.（他是个彻头彻尾的绅士——总为别人扶门。）
My grandma is kind through and through; she never has a bad word for anyone.（我奶奶极其善良，从不说别人坏话。）
That movie is a comedy through and through—I laughed nonstop for two hours.（那部电影完全是喜剧——我笑了整整两小时。）
强调对某个地方、领域或知识了如指掌、烂熟于心。
I’ve lived in New York since I was a kid—I know the city through and through.（我从小住在纽约，对这座城市了如指掌。）
She’s studied Shakespeare for years—she knows his plays through and through.（她研究莎士比亚多年，对他的戏剧滚瓜烂熟。）
描述物体从一端穿到另一端，没有停留。
The bullet went through and through his leg—luckily, it missed the bone.（子弹贯穿了他的腿——幸好没打中骨头。）
The nail was hammered through and through the wooden board.（钉子被钉穿了木板。）
The rain poured so hard it felt like it was coming through and through my umbrella.（雨下得太大，感觉穿透了我的伞。）
强调某种状态深入骨髓、毫无遗漏。
We got caught in the storm and were soaked through and through.（我们被暴风雨淋了，浑身湿透。）
After playing in the snow for hours, the kids were cold through and through.（在雪里玩了几小时后，孩子们冻得浑身冰凉。）
The fear of failing the exam was with me through and through that week.（那周我一直被考试不及格的恐惧笼罩。）
位置灵活：通常放在句末（如"soaked through and through"），或紧跟被修饰的形容词/动词（如"know through and through"）；
语气强调：比"completely"或"totally"更具画面感，突出"从内到外、毫无保留"的程度；
口语&书面通用：既可以用于日常对话（如" He’s a nerd through and through!"），也可以用于正式语境（如" The report was researched through and through."）。
"through and through" 是一个强化程度的短语，核心是"彻底"——无论是人的本质、对事物的熟悉，还是物理穿透或状态极致，都能通过它传递"毫无保留"的感觉。记住几个典型场景（特质、熟悉、穿透、状态），就能轻松掌握其用法！