obtain/attain/avail/available/entertain/certain/detain/captain
记忆：词根tain == hold
1. obtain [ Eb5tein ] To succeed in gaining possession of as the result of planning or endeavor ob-tain vt. 获得, 得到 What do I expect to obtain from you? Nothing! 我期待着从你那儿得到什么呢？什么也不期待！
2. attain [ E5tein] To gain as an objective; achieve; To arrive at, as by virtue of persistence at-tain vt. 达到, 获得 n. 达到 Leo Iacocca attained the position of President of the Ford Motors. 艾柯卡获得了福特汽车公司总裁的职位。
3. avail [E5veil] v. 有益于, 有利于 Finally we availed ourselves of a chance of further study in a university. 最后我们得到了在大学进修的机会。
4. available [ E5veilEbl] adj. 可用到的, 可利用的, 有空的 How can we get in touch with him? No phone is available here. 我们怎样才能和他取得联系呢？这儿没有电话可用啊。
5. entertain [ 7entE5tein ] enter-tain vt. 娱乐, 招待 These programs are to entertain the noble guests from France. 这些节日将用来招待法国来的贵客。
6. certain [ 5sE:tEn ] cer-tain adj. 确定的, 某一个 A certain Mr. Yan is asking for you at the school gate. 一个姓严的先生在校门口找你。
7. detain [ di5tein] de-tain v. 拘留, 留住, 阻止 When crossing the border, he was detained by the police. 越境时他被警察拘留了。
8. captain [ 5kAptin ] cap-tain n. 队长, (空军, 海军)上校, (陆军)上尉 n. 指挥, 统帅 The captain received the cup on behalf of the team. 除非代表球队领了奖。
另类阅读：
He tried to obtain a ticket of the film that was hardly available at that time. Finally he attained the chance to entertain himself. In the film a captain was detained for a certain reason.