想要往前进，脚丫要往后蹬
核心不是腹肌，夹紧不等于用力；像穿紧身衣，腰腹臀同时出力；不憋气、能呼吸，游得稳又省力。
日常英语对话场景句库
💬 英语地道表达分类整理（含中文释义）
Hop over the log \ Jump onto the rock Look at the caterpillar We can play on the rocks / in the stream Go away bugs Help me make a wall watch me run / play around the rock /up/down the hill / across the log I like to talk / I want to eat fruits Stop playing hide and seek with me. Just tell me the truth. See where I sit , I sit on the log Can you move like this ,yes I can move like that You will fall off the log \can you hold this rock “The air was hot and steamy. The air is fresh
1、两数之和
设计原则：用抽象构建框架，用实现扩展细节 单一职责原则告诉我们实现类要职责单一；里氏替换原则告诉我们不要破坏继承体系；依赖倒置原则告诉我们要面向接口编程；接口隔离原则告诉我们在设计接口的时候要精简单一；迪米特法则告诉我们要降低耦合。而开闭原则是总纲，他告诉我们要对扩展开放，对修改关闭。
Java框中的AbstractQueuedSynchronizer[AQS队列同步器]框架：有锁同步[睡眠与唤起]