如图所示为钓鱼竿钓鱼时的示意图，O为支点，F₁表示手对钓鱼竿的作用力，请在图中画出鱼线对钓鱼竿拉力F₂的力臂L₂ 。

根据要求作文。

生活中，我们可以听到各种铃声：闹铃声、门铃声、电话铃声，校园里的铃声、车站码头的铃声、剧场影院的铃声……  铃声，无处不在，可能带给你难忘的记忆，还可能带给你无穷的回味……

请以“铃声响过之后”为题目，写一篇不少于600文章。

要求：①以记叙、描写为主，兼用其他表达方式；②内容充实，表达真情实感，行文流畅。③文中不得出现真实的姓名、校名、地名。

人们常说，操场上跑不出千里马，花盆里长不出万年松。这启示我们（    ）

    Hi everyone! Good news. A book sale.____will people drive cars in space? Will you meet traffic ____? You'll get answers from our books. Are ____ interesting for you? They can do heavy work. You ____enjoy short working hours. We've got some storybooks about them. What's the best way to buy products at very good prices? Our books will tell you something about online ____? 

    Welcome to the playground this Saturday.

    Have a nice day!