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我家门前的矮墙,被爬山虎的藤条缠得严严实实。每当我看到茂密的爬山虎,总是想:爬山虎为什么能紧紧地爬在墙上呢?
The low wall in front of my house was tightly covered with ivy canes. Whenever I see lush ivy, always think: why ivy can cling to the wall tightly?