请仔细阅读以下材料，并按照要求用英语写一篇150词左右的文章。
Scientists have observed that humans experience happiness from a wide range of stimuli(刺激), from traveling to an ideal destination to redecorating one's home or from winning a game of soccer to eating a delicious meal. Simply watching a favorite television show or laughing at a funny joke can lift a depressed mood. While the happiness produced by such experiences tends to be short lived, a wide social network does promote a more long-lasting state of happiness as a lifestyle.
Surprisingly, income is not a primary factor in determining a person's level of happiness once the basic needs of food, clothing, and shelter have been met. More important is one's social network. Being socially active may be more effective in increasing one's immunity（免疫力）to illness than a vaccine. Misery may love company, but so does happiness, and having close friends and family is vital to one's overall level of happiness. Even sharing one's home with an animal companion can make a person happier.
【写作内容】
1）用约30个单词概括以上材料的主要内容；
2）用约120个词就“幸福”这一话题谈谈你的理解，内容包括：
⑴幸福对你来说意味着什么？
⑵描写一次给你带来幸福感的经历。
⑶面对学习压力，如何提升自己的幸福感？（至少两点）
【写作要求】
1）作文中不能出现真实姓名和学校名称；
2）不必写标题;
【评分标准】
内容完整，语言规范，语篇连贯，词数适当。
