Severe严重 Acute急性的 Respiratory 呼吸的Syndrome并发症. 严重急性呼吸系统综合症
The food levels in the deeper layers of the ocean 在更深层次的海低are greatly reduced，and the energy constraints约束 on the animals are much more severe更加严重.
The mistake led to severe problems. South Asia once experienced severe严重的 drought干旱 condition and India had been importing进口 wheat on a large scale规模 from the United States.同义替换：grim形容词，严峻的/grievous形容词，及其严重的/forbidding形容词，严厉的/stark形容词，严酷的/stringent形容词 严格的strict形容词，严谨的
词形词形变化
sever形容词，非常严重的-severely形容词，严重的-severity名词，严重，极为恶劣
attach动词，系，绑，贴；附加，附上
A file文件 is attached to附有 this email电子邮件.
反义：untie动词，解开
考试真题：Facing their children's complaints of "nothing to do"孩子们抱怨无事可做，parents were shelling out付款 large numbers of 大量dollars for various forms of entertainment各种形式的娱乐.
Enjoy your entertainment after uphill 艰难的work.
近义词：amusement名词，愉悦 delight名词，愉快 diversion名词，娱乐 distraction名词，娱乐 enjoyment名词，享受 relaxation名词，娱乐活动
反义词：bore动词，使厌烦 bummer名词，令人不快的事 downer名词，令人悲伤（沮丧）的情景
词根词源：entertain使娱乐 ment名词后缀，表示行为，行为的过程或结果→entertainment娱乐 前缀：enter在…之间 词根：tain保留 后缀：ment名词后缀，表示行为，行为的过程或结果
Amusement parks provide thrills刺激 and entertainment娱乐.
entertain动词，使快乐，心存 entertainer名词，艺人 entertaining形容词，令人愉快的entertainment名词，娱乐活动entertainment industry名词短语，娱乐业
